wip(plugins): save selected-terminal sharing authority and contract

# Conflicts:
#	electron/plugins/hostService.cjs
#	packages/plugin-cli/src/manifest.ts
#	packages/plugin-contract/src/index.ts
#	packages/plugin-sdk/src/index.ts

.github/workflows/test.yml

@@ -49,6 +49,12 @@ jobs:
       - name: Verify Codex App Server schema
         run: npm run check:codex-app-server-schema
 
+      - name: Verify plugin contract and runtime boundaries
+        run: |
+          npm run check:plugin-contract
+          npm run test:plugin-runtime
+          node --test --import tsx components/settings/tabs/Plugin*.test.tsx
+
       - name: Test
         run: npm test
 

AGENTS.md

@@ -106,10 +106,13 @@ Placement rules (`resolveAgentKinds` in `toolSurfaces.cjs`):
 
 **Harness domain (`catalog/harness.cjs`):** Catty executes these locally in `capabilityTools.executeLocalCattyCapability`. The read-only `harness.terminal.read_context` also exposes `netcatty/readContext` to MCP, with scope validation before and after the existing renderer bridge call. It reuses the sidebar reader through the screen snapshot registry (80 rows by default, maximum 300); no script or command runs. Other harness tools remain Catty-only. `harness.web.search` is omitted when web search is not configured.
 
-## Plugin host runtime (internal preview)
+## Plugin host runtime
 
-The phase-2 plugin host lives under `electron/plugins/` and is disabled unless
-`NETCATTY_PLUGIN_DEV=1` is present at application launch. Public wire and package
+The plugin host under `electron/plugins/` exposes browser-only packages in normal
+Settings. `NETCATTY_PLUGIN_DEV=1` admits advanced development packages, without
+granting their permissions. Admission and default placement share
+`domain/pluginRuntimePolicy.cjs`; permission explanations shared with native
+prompts live in `domain/pluginPermissionDescriptions.cjs`. Public wire and package
 types still come only from `packages/plugin-contract/schema/`; do not add a
 second private RPC shape when extending the host.
 

App.tsx

@@ -12,6 +12,7 @@ import { ToastProvider } from './components/ui/toast';
 import { TooltipProvider } from './components/ui/tooltip';
 import { ScriptAutomationRoot } from './components/scripts/ScriptAutomationRoot';
 import { ExternalMcpApprovalsHost } from './components/ai/ExternalMcpApprovalsHost';
+import { PluginHostInteractionHost } from './components/plugins/PluginHostInteractionHost';
 import { PluginAuthenticationHost } from './components/plugins/PluginAuthenticationHost';
 import { MultilinePasteConfirmHost } from './components/terminal/MultilinePasteConfirmDialog';
 import { useExternalMcpGrantPersister } from './components/ai/useExternalMcpGrantPersister';
@@ -86,6 +87,7 @@ function AppWithProviders({ settings, appLock }: { settings: SettingsState; appL
               <ScriptAutomationRoot />
               <ExternalMcpApprovalsHost />
               <PluginAuthenticationHost />
+              <PluginHostInteractionHost />
               <MultilinePasteConfirmHost />
               <VaultPublisher>
                 <SessionPublisher persistSessionRestore={!isPeerSessionWindow}>

application/app/AppView.tsx

@@ -167,7 +167,8 @@ function AppPluginKeybindingThemeHost({
   sessions: any[];
   workspaces: any[];
 }) {
-  const appThemeStyle = useAppThemeStyle();
+  // View environment is global in the current host: publish committed colors only.
+  const appThemeStyle = useAppThemeStyle(false);
   const { resolvedTheme, uiLanguage } = useSettingsChromeStore();
   const pluginThemeTokens = useMemo(
     () => selectPluginThemeTokens(appThemeStyle as Record<string, unknown>),

application/app/useAppThemeStyle.ts

@@ -1,3 +1,4 @@
+import { usePluginThemeRevision } from '../state/usePluginThemeRuntime';
 import type React from 'react';
 import { useMemo } from 'react';
 
@@ -12,17 +13,20 @@ import { getUiThemeById } from '../../infrastructure/config/uiThemes';
  * settingsChromeStore so accent drags only re-render the leaf that applies the
  * vars, never the App shell.
  */
-export function useAppThemeStyle(): React.CSSProperties {
+export function useAppThemeStyle(includePreview = true): React.CSSProperties {
+  const pluginThemeRevision = usePluginThemeRevision();
   const { accentMode, customAccent } = useAppearanceChromeStore();
   const { resolvedTheme, darkUiThemeId, lightUiThemeId } = useSettingsChromeStore();
   return useMemo(() => {
+    void pluginThemeRevision; // getUiThemeById reads this external registry revision.
     const tokens = getUiThemeById(
       resolvedTheme,
       resolvedTheme === 'dark' ? darkUiThemeId : lightUiThemeId,
+      includePreview,
     ).tokens;
     return {
       ...buildAppThemeCssVars(tokens, accentMode, customAccent),
       colorScheme: resolvedTheme,
     } as React.CSSProperties;
-  }, [accentMode, customAccent, darkUiThemeId, lightUiThemeId, resolvedTheme]);
+  }, [accentMode, customAccent, darkUiThemeId, lightUiThemeId, resolvedTheme, pluginThemeRevision, includePreview]);
 }

application/i18n/locales/en/core.ts

@@ -1235,8 +1235,101 @@ Highlight the focused split pane:
   'deepLink.jms.invalid': 'Invalid JumpServer link',
   'deepLink.jms.unsupported': 'Unsupported JumpServer protocol: {{protocol}}',
   'settings.tab.plugins': 'Plugins',
-  'settings.plugins.title': 'Plugin settings',
-  'settings.plugins.description': 'Native, validated settings contributed by development plugins.',
+  "settings.plugins.manager.installed": "Installed plugins",
+  "settings.plugins.manager.import": "Import .ncpkg",
+  "settings.plugins.manager.preview": "Imported packages stay disabled until you review and enable them.",
+  "settings.plugins.manager.empty": "Import a local plugin package to get started.",
+  "settings.plugins.manager.enabled": "Enabled",
+  "settings.plugins.manager.disabled": "Disabled",
+  "settings.plugins.manager.enable": "Enable",
+  "settings.plugins.manager.disable": "Disable",
+  "settings.plugins.manager.remove": "Uninstall",
+  "settings.plugins.manager.removeNote": "Uninstall removes package code and local KV data. User-owned settings, secrets and sync sidecars are retained.",
+  "settings.plugins.permissions.statusUnknown": "Status unknown",
+  "plugins.sidebar.extensions": "Extension pages",
+  "plugins.sidebar.selectTerminal": "Select an open terminal first.",
+  "plugins.sidebar.loading": "Loading extension page…",
+  "plugins.vault.loading": "Loading plugin page…",
+  "plugins.vault.extensions": "Extensions",
+  "plugins.vault.back": "Back to hosts",
+  "plugins.interaction.title": "Plugin request",
+  "plugins.interaction.sharing": "Text you share becomes available to this plugin and its granted capabilities, including network access. Reading does not approve a new network destination.",
+  "plugins.interaction.input": "Input text",
+  "plugins.interaction.filter": "Filter choices",
+  "plugins.interaction.preview": "Preview clipboard",
+  "plugins.interaction.previewNote": "The clipboard is read only after you choose Preview. You can then inspect the text and separately confirm sharing it.",
+  "plugins.interaction.previewAction": "Preview clipboard",
+  "plugins.interaction.share": "Share with plugin",
+  "plugins.interaction.copy": "Copy to clipboard",
+  "plugins.interaction.failed": "This request expired or could not be completed.",
+  "settings.plugins.permissions.current": "Matches the current activation",
+  "settings.plugins.permissions.inactive": "Inactive for the current activation",
+  "settings.plugins.permissions.title": "Saved grants",
+  "settings.plugins.permissions.refresh": "Refresh",
+  "settings.plugins.permissions.loading": "Loading grants...",
+  "settings.plugins.permissions.empty": "No saved grants. One-use decisions are not retained.",
+  "settings.plugins.permissions.always": "Until revoked",
+  "settings.plugins.permissions.application": "Until Netcatty exits",
+  "settings.plugins.permissions.session": "Until the session closes",
+  "settings.plugins.permissions.audit": "Recent security events (up to 100)",
+  "settings.plugins.permissions.revoke": "Disable and revoke all grants",
+  "settings.plugins.permissions.revokeNote": "This disables the plugin, cancels its work, and removes saved grants. Enable it again to request new access.",
+  "settings.plugins.permissions.unavailable": "Plugin permission management is unavailable",
+  "settings.plugins.manager.permissions": "Declared permissions",
+  "settings.plugins.manager.permissionNote": "From the manifest, not a grant. Enabled allows lazy activation; required permissions are requested before first activation and optional permissions when used. Sensitive operations still pass host checks.",
+  "settings.plugins.manager.noPermissions": "No privileged permissions declared.",
+  "settings.plugins.manager.required": "Required",
+  "settings.plugins.manager.optional": "Optional",
+  "settings.plugins.themes.title": "Plugin themes",
+  "settings.plugins.themes.description": "Preview changes only this window. Apply saves this device’s selection. Personal accent, fonts and terminal overrides stay in control.",
+  "settings.plugins.themes.empty": "No enabled plugin themes for this mode.",
+  "settings.plugins.themes.choose": "Choose a theme",
+  "settings.plugins.themes.unavailable": "Saved theme unavailable; using the host default",
+  "settings.plugins.themes.applied": "Applied",
+  "settings.plugins.themes.preview": "Preview",
+  "settings.plugins.themes.apply": "Apply",
+  "settings.plugins.themes.cancel": "Cancel preview",
+  "settings.plugins.themes.restore": "Restore default",
+  "settings.plugins.themes.invalid": "Some theme palettes were rejected or unavailable.",
+  "settings.plugins.themes.failed": "Could not apply theme.",
+  "settings.plugins.manager.dataTheme": "Theme pack: validated colors, no executable runtime.",
+  "settings.plugins.manager.browser": "Browser runtime: privileged access goes through host permission brokers.",
+  "settings.plugins.manager.advanced": "Advanced runtime: full Node filesystem and network authority. Broker permissions cannot restrict this access. Development preview only.",
+  "settings.plugins.manager.data": "Local KV stays on this device. Only non-secret settings explicitly marked for sync participate in encrypted cloud sidecars. Packages and permission grants do not sync.",
+  "settings.plugins.market.results": "{count} plugins",
+  "settings.plugins.manager.lastError": "Last recorded error",
+  "settings.plugins.market.offline": "Registry unavailable. Showing the last valid catalog or bundled examples. Installation is unavailable until refresh succeeds.",
+  "settings.plugins.manager.details": "View details",
+  "settings.plugins.manager.noDescription": "No description provided.",
+  "settings.plugins.status": "Notices: {count}",
+  "settings.plugins.info": "Plugin information",
+  "settings.plugins.manager.noVaultShort": "Secret storage unavailable",
+  "settings.plugins.market.offlineShort": "Offline catalog · installation unavailable",
+  "settings.plugins.market.readmeInfo": "About this README",
+  "settings.plugins.market.installed": "Installed",
+  "settings.plugins.market.sourceBadge": "Source example",
+  "settings.plugins.market.title": "Marketplace",
+  "settings.plugins.market.note": "Curated open-source plugins. Review is not a security certification. Updates are manual.",
+  "settings.plugins.market.back": "All plugins",
+  "settings.plugins.market.install": "Install this version (disabled)",
+  "settings.plugins.market.installNote": "This replaces and stops the installed version. Review its permissions in Installed plugins before enabling.",
+  "settings.plugins.market.sourceOnly": "First-party source example. Build with the local CLI and import the .ncpkg; no downloadable release has been published.",
+  "settings.plugins.market.readmeNote": "Pinned to the commit above. HTML is inert and remote images are not loaded. Written by the plugin author.",
+  "settings.plugins.manager.noVault": "System key storage is unavailable. Secret and credential operations are blocked; browsing and non-secret plugins still work.",
+  "settings.plugins.manager.sensitive": "Sensitive access: review the data and resource scope before granting.",
+  "settings.plugins.manager.dual": "Browser is the default runtime. This package also includes a Node entrypoint with full device authority; developer mode only.",
+  "settings.plugins.manager.advancedDeclaration": "Browser entrypoint with advanced permission declarations. Not eligible for normal browser-only mode; review every declared permission.",
+  "settings.plugins.market.retry": "Retry",
+  "settings.plugins.market.empty": "No catalog entries are available. You can still import a local browser plugin.",
+  "settings.plugins.market.emptyReadme": "This README is empty.",
+  "settings.plugins.market.search": "Search name, author or description",
+  "settings.plugins.market.noResults": "No matching plugins. Try another search.",
+  "settings.plugins.market.manifest": "Compatibility and permissions",
+  "settings.plugins.manager.unbounded": "No narrower resource scope is declared. Check the actual scope in the permission prompt.",
+  "settings.plugins.openView": "Open",
+  "settings.plugins.openManager": "Open plugin manager",
+  "settings.plugins.title": "Plugins",
+  "settings.plugins.description": "Manage your plugins and explore the catalog.",
   'settings.plugins.loading': 'Loading plugin settings…',
   'settings.plugins.empty': 'No enabled plugin contributes settings.',
   'settings.plugins.scopeContext': 'Open this setting in its {scope} context.',

application/i18n/locales/es/core.ts

@@ -1235,8 +1235,101 @@ Resalta el panel dividido enfocado:
   'deepLink.jms.invalid': 'Enlace JumpServer inválido',
   'deepLink.jms.unsupported': 'Protocolo JumpServer no compatible: {{protocol}}',
   'settings.tab.plugins': 'Plugins',
-  'settings.plugins.title': 'Configuración de plugins',
-  'settings.plugins.description': 'Ajustes nativos y validados que aportan los plugins de desarrollo.',
+  "settings.plugins.manager.installed": "Plugins instalados",
+  "settings.plugins.manager.import": "Importar .ncpkg",
+  "settings.plugins.manager.preview": "Los paquetes importados permanecen desactivados hasta que los revises y actives.",
+  "settings.plugins.manager.empty": "Importa un paquete local para empezar.",
+  "settings.plugins.manager.enabled": "Activado",
+  "settings.plugins.manager.disabled": "Desactivado",
+  "settings.plugins.manager.enable": "Activar",
+  "settings.plugins.manager.disable": "Desactivar",
+  "settings.plugins.manager.remove": "Desinstalar",
+  "settings.plugins.manager.removeNote": "La desinstalación elimina el código y los datos KV locales. Se conservan los ajustes del usuario, los secretos y los datos auxiliares de sincronización.",
+  "settings.plugins.permissions.statusUnknown": "Estado desconocido",
+  "plugins.sidebar.extensions": "Páginas de extensiones",
+  "plugins.sidebar.selectTerminal": "Selecciona primero un terminal abierto.",
+  "plugins.sidebar.loading": "Cargando página de extensión…",
+  "plugins.vault.loading": "Cargando página del plugin…",
+  "plugins.vault.extensions": "Extensiones",
+  "plugins.vault.back": "Volver a hosts",
+  "plugins.interaction.title": "Solicitud de complemento",
+  "plugins.interaction.sharing": "El texto compartido estará disponible para este complemento y sus capacidades autorizadas, incluida la red. Leer no autoriza un nuevo destino de red.",
+  "plugins.interaction.input": "Introducir texto",
+  "plugins.interaction.filter": "Filtrar opciones",
+  "plugins.interaction.preview": "Vista previa del portapapeles",
+  "plugins.interaction.previewNote": "El portapapeles se lee al elegir Vista previa. Revise el texto y confirme por separado que desea compartirlo.",
+  "plugins.interaction.previewAction": "Vista previa del portapapeles",
+  "plugins.interaction.share": "Compartir con el complemento",
+  "plugins.interaction.copy": "Copiar al portapapeles",
+  "plugins.interaction.failed": "La solicitud caducó o no pudo completarse.",
+  "settings.plugins.permissions.current": "Coincide con la ejecución actual",
+  "settings.plugins.permissions.inactive": "No activa para la ejecución actual",
+  "settings.plugins.permissions.title": "Autorizaciones guardadas",
+  "settings.plugins.permissions.refresh": "Actualizar",
+  "settings.plugins.permissions.loading": "Cargando autorizaciones...",
+  "settings.plugins.permissions.empty": "No hay autorizaciones guardadas. Las decisiones de un solo uso no se conservan.",
+  "settings.plugins.permissions.always": "Hasta su revocación",
+  "settings.plugins.permissions.application": "Hasta cerrar Netcatty",
+  "settings.plugins.permissions.session": "Hasta cerrar la sesión",
+  "settings.plugins.permissions.audit": "Eventos de seguridad recientes (hasta 100)",
+  "settings.plugins.permissions.revoke": "Desactivar y revocar todas las autorizaciones",
+  "settings.plugins.permissions.revokeNote": "Desactiva el complemento, cancela su trabajo y elimina las autorizaciones guardadas. Actívelo para solicitar acceso de nuevo.",
+  "settings.plugins.permissions.unavailable": "La gestión de permisos no está disponible",
+  "settings.plugins.manager.permissions": "Permisos declarados",
+  "settings.plugins.manager.permissionNote": "Del manifiesto, no es una autorización. Activado permite la activación diferida; los permisos obligatorios se solicitan antes del primer uso y los opcionales cuando se necesitan. Las operaciones sensibles siguen verificándose.",
+  "settings.plugins.manager.noPermissions": "No se han declarado permisos privilegiados.",
+  "settings.plugins.manager.required": "Obligatorio",
+  "settings.plugins.manager.optional": "Opcional",
+  "settings.plugins.themes.title": "Temas de plugins",
+  "settings.plugins.themes.description": "La vista previa solo cambia esta ventana. Aplicar guarda la selección en este dispositivo. Se conservan los ajustes personales.",
+  "settings.plugins.themes.empty": "No hay temas habilitados para este modo.",
+  "settings.plugins.themes.choose": "Elegir tema",
+  "settings.plugins.themes.unavailable": "Tema guardado no disponible; se usa el predeterminado",
+  "settings.plugins.themes.applied": "Aplicado",
+  "settings.plugins.themes.preview": "Vista previa",
+  "settings.plugins.themes.apply": "Aplicar",
+  "settings.plugins.themes.cancel": "Cancelar vista previa",
+  "settings.plugins.themes.restore": "Restaurar predeterminado",
+  "settings.plugins.themes.invalid": "Algunas paletas no están disponibles o no son válidas.",
+  "settings.plugins.themes.failed": "No se pudo aplicar el tema.",
+  "settings.plugins.manager.dataTheme": "Paquete de temas: colores validados, sin ejecución de código.",
+  "settings.plugins.manager.browser": "Entorno de navegador: el acceso privilegiado pasa por los controles de permisos del anfitrión.",
+  "settings.plugins.manager.advanced": "Entorno avanzado: acceso completo de Node al sistema de archivos y a la red. Los permisos del intermediario no restringen este acceso. Solo para desarrollo.",
+  "settings.plugins.manager.data": "Los datos KV permanecen en este dispositivo. Solo los ajustes no secretos marcados para sincronización participan en los datos auxiliares cifrados. Los paquetes y las autorizaciones no se sincronizan.",
+  "settings.plugins.market.results": "{count} plugins",
+  "settings.plugins.manager.lastError": "Último error registrado",
+  "settings.plugins.market.offline": "El registro no está disponible. Se muestra el último catálogo válido o los ejemplos incluidos. La instalación requiere una actualización correcta.",
+  "settings.plugins.manager.details": "Ver detalles",
+  "settings.plugins.manager.noDescription": "No se proporcionó una descripción.",
+  "settings.plugins.status": "{count} avisos",
+  "settings.plugins.info": "Información de plugins",
+  "settings.plugins.manager.noVaultShort": "Almacenamiento de secretos no disponible",
+  "settings.plugins.market.offlineShort": "Catálogo sin conexión · instalación no disponible",
+  "settings.plugins.market.readmeInfo": "Acerca de este README",
+  "settings.plugins.market.installed": "Instalado",
+  "settings.plugins.market.sourceBadge": "Ejemplo de código",
+  "settings.plugins.market.title": "Catálogo",
+  "settings.plugins.market.note": "Plugins de código abierto seleccionados. La revisión no certifica su seguridad. Las actualizaciones son manuales.",
+  "settings.plugins.market.back": "Todos los plugins",
+  "settings.plugins.market.install": "Instalar esta versión (desactivada)",
+  "settings.plugins.market.installNote": "Esto reemplaza y detiene la versión instalada. Revisa sus permisos antes de activarla.",
+  "settings.plugins.market.sourceOnly": "Ejemplo propio con código fuente. Compílalo con la CLI local e importa el .ncpkg; no hay versión publicada para descargar.",
+  "settings.plugins.market.readmeNote": "Fijado al commit indicado. El HTML no se ejecuta y las imágenes remotas no se cargan. Contenido del autor.",
+  "settings.plugins.manager.noVault": "El almacén de claves del sistema no está disponible. Se bloquean secretos y credenciales; el catálogo y los plugins que no los usan siguen disponibles.",
+  "settings.plugins.manager.sensitive": "Acceso sensible: revisa los datos y el alcance antes de autorizar.",
+  "settings.plugins.manager.dual": "El navegador es la opción predeterminada. El paquete también incluye una entrada Node con acceso completo al dispositivo; solo para desarrollo.",
+  "settings.plugins.manager.advancedDeclaration": "Entrada de navegador con permisos avanzados declarados. No se admite en el modo normal; revisa cada permiso.",
+  "settings.plugins.market.retry": "Reintentar",
+  "settings.plugins.market.empty": "No hay entradas en el catálogo. Puedes importar un plugin local de navegador.",
+  "settings.plugins.market.emptyReadme": "Este README está vacío.",
+  "settings.plugins.market.search": "Buscar nombre, autor o descripción",
+  "settings.plugins.market.noResults": "No hay plugins coincidentes. Prueba otra búsqueda.",
+  "settings.plugins.market.manifest": "Compatibilidad y permisos",
+  "settings.plugins.manager.unbounded": "No se declara un alcance de recursos más limitado. Revisa el alcance real en la solicitud de permiso.",
+  "settings.plugins.openView": "Abrir",
+  "settings.plugins.openManager": "Abrir gestor de plugins",
+  "settings.plugins.title": "Plugins",
+  "settings.plugins.description": "Gestiona tus plugins y explora el catálogo.",
   'settings.plugins.loading': 'Cargando ajustes del plugin…',
   'settings.plugins.empty': 'Ningún plugin activado aporta ajustes.',
   'settings.plugins.scopeContext': 'Abre este ajuste en su contexto de {scope}.',

application/i18n/locales/ru/core.ts

@@ -1130,8 +1130,101 @@ export const ruCoreMessages: Messages = {
   'deepLink.jms.unsupported': 'Неподдерживаемый протокол JumpServer: {{protocol}}',
 
   'settings.tab.plugins': 'Плагины',
-  'settings.plugins.title': 'Настройки плагинов',
-  'settings.plugins.description': 'Проверенные нативные настройки от плагинов разработки.',
+  "settings.plugins.manager.installed": "Установленные плагины",
+  "settings.plugins.manager.import": "Импорт .ncpkg",
+  "settings.plugins.manager.preview": "Импортированные пакеты отключены до проверки и включения.",
+  "settings.plugins.manager.empty": "Импортируйте локальный пакет плагина.",
+  "settings.plugins.manager.enabled": "Включён",
+  "settings.plugins.manager.disabled": "Отключён",
+  "settings.plugins.manager.enable": "Включить",
+  "settings.plugins.manager.disable": "Отключить",
+  "settings.plugins.manager.remove": "Удалить",
+  "settings.plugins.manager.removeNote": "Удаление очищает код пакета и локальные данные KV. Настройки пользователя, секреты и данные синхронизации сохраняются.",
+  "settings.plugins.permissions.statusUnknown": "Состояние неизвестно",
+  "plugins.sidebar.extensions": "Страницы расширений",
+  "plugins.sidebar.selectTerminal": "Сначала выберите открытый терминал.",
+  "plugins.sidebar.loading": "Загрузка страницы расширения…",
+  "plugins.vault.loading": "Загрузка страницы плагина…",
+  "plugins.vault.extensions": "Расширения",
+  "plugins.vault.back": "К хостам",
+  "plugins.interaction.title": "Запрос плагина",
+  "plugins.interaction.sharing": "Переданный текст доступен плагину и его разрешённым возможностям, включая сеть. Чтение не разрешает новый сетевой адрес.",
+  "plugins.interaction.input": "Ввести текст",
+  "plugins.interaction.filter": "Фильтр вариантов",
+  "plugins.interaction.preview": "Предпросмотр буфера обмена",
+  "plugins.interaction.previewNote": "Буфер читается только после нажатия предпросмотра. Затем проверьте текст и отдельно подтвердите передачу.",
+  "plugins.interaction.previewAction": "Предпросмотр буфера обмена",
+  "plugins.interaction.share": "Передать плагину",
+  "plugins.interaction.copy": "Копировать в буфер обмена",
+  "plugins.interaction.failed": "Запрос истёк или не выполнен.",
+  "settings.plugins.permissions.current": "Соответствует текущему запуску",
+  "settings.plugins.permissions.inactive": "Не действует для текущего запуска",
+  "settings.plugins.permissions.title": "Сохранённые разрешения",
+  "settings.plugins.permissions.refresh": "Обновить",
+  "settings.plugins.permissions.loading": "Загрузка разрешений...",
+  "settings.plugins.permissions.empty": "Сохранённых разрешений нет. Одноразовые решения не сохраняются.",
+  "settings.plugins.permissions.always": "До отзыва",
+  "settings.plugins.permissions.application": "До выхода из Netcatty",
+  "settings.plugins.permissions.session": "До закрытия сеанса",
+  "settings.plugins.permissions.audit": "Последние события безопасности (до 100)",
+  "settings.plugins.permissions.revoke": "Отключить и отозвать все разрешения",
+  "settings.plugins.permissions.revokeNote": "Плагин будет отключён, его задачи отменены, а сохранённые разрешения удалены. Включите его для нового запроса доступа.",
+  "settings.plugins.permissions.unavailable": "Управление разрешениями недоступно",
+  "settings.plugins.manager.permissions": "Заявленные разрешения",
+  "settings.plugins.manager.permissionNote": "Из манифеста, а не предоставленные права. Включение допускает отложенную активацию; обязательные разрешения запрашиваются перед ней, необязательные — при использовании. Чувствительные операции проверяются приложением.",
+  "settings.plugins.manager.noPermissions": "Привилегированные разрешения не заявлены.",
+  "settings.plugins.manager.required": "Обязательно",
+  "settings.plugins.manager.optional": "Необязательно",
+  "settings.plugins.themes.title": "Темы плагинов",
+  "settings.plugins.themes.description": "Предпросмотр меняет только это окно. Применение сохраняет выбор на этом устройстве. Личные настройки сохраняются.",
+  "settings.plugins.themes.empty": "Нет включённых тем для этого режима.",
+  "settings.plugins.themes.choose": "Выберите тему",
+  "settings.plugins.themes.unavailable": "Сохранённая тема недоступна; используется стандартная палитра",
+  "settings.plugins.themes.applied": "Применено",
+  "settings.plugins.themes.preview": "Предпросмотр",
+  "settings.plugins.themes.apply": "Применить",
+  "settings.plugins.themes.cancel": "Отменить предпросмотр",
+  "settings.plugins.themes.restore": "Сбросить тему",
+  "settings.plugins.themes.invalid": "Некоторые палитры недоступны или отклонены.",
+  "settings.plugins.themes.failed": "Не удалось применить тему.",
+  "settings.plugins.manager.dataTheme": "Пакет тем: проверенные цвета без выполнения кода.",
+  "settings.plugins.manager.browser": "Браузерная среда: привилегированный доступ проходит через проверку разрешений приложения.",
+  "settings.plugins.manager.advanced": "Расширенная среда: полный доступ Node к файловой системе и сети. Разрешения посредника не ограничивают этот доступ. Только для разработки.",
+  "settings.plugins.manager.data": "Данные KV остаются на устройстве. Синхронизируются только явно отмеченные несекретные настройки в зашифрованных данных. Пакеты и разрешения не синхронизируются.",
+  "settings.plugins.market.results": "Плагинов: {count}",
+  "settings.plugins.manager.lastError": "Последняя записанная ошибка",
+  "settings.plugins.market.offline": "Реестр недоступен. Показан последний корректный каталог или встроенные примеры. Для установки необходимо успешно обновить каталог.",
+  "settings.plugins.manager.details": "Подробнее",
+  "settings.plugins.manager.noDescription": "Описание не предоставлено.",
+  "settings.plugins.status": "Уведомления: {count}",
+  "settings.plugins.info": "Информация о плагинах",
+  "settings.plugins.manager.noVaultShort": "Хранилище секретов недоступно",
+  "settings.plugins.market.offlineShort": "Каталог офлайн · установка недоступна",
+  "settings.plugins.market.readmeInfo": "Об этом README",
+  "settings.plugins.market.installed": "Установлен",
+  "settings.plugins.market.sourceBadge": "Пример исходного кода",
+  "settings.plugins.market.title": "Каталог",
+  "settings.plugins.market.note": "Отобранные плагины с открытым кодом. Проверка не гарантирует безопасность. Обновления выполняются вручную.",
+  "settings.plugins.market.back": "Все плагины",
+  "settings.plugins.market.install": "Установить эту версию (отключённой)",
+  "settings.plugins.market.installNote": "Установленная версия будет заменена и остановлена. Проверьте разрешения перед включением.",
+  "settings.plugins.market.sourceOnly": "Пример из этого проекта. Соберите локальной CLI и импортируйте .ncpkg; готовый пакет для скачивания не опубликован.",
+  "settings.plugins.market.readmeNote": "Зафиксирован указанный коммит. HTML не выполняется, внешние изображения не загружаются. Текст автора плагина.",
+  "settings.plugins.manager.noVault": "Системное хранилище ключей недоступно. Операции с секретами и учётными данными заблокированы; каталог и плагины без секретов доступны.",
+  "settings.plugins.manager.sensitive": "Чувствительный доступ: проверьте данные и область ресурсов перед разрешением.",
+  "settings.plugins.manager.dual": "По умолчанию используется браузерная среда. Пакет также содержит вход Node с полным доступом к устройству; только для разработчиков.",
+  "settings.plugins.manager.advancedDeclaration": "Браузерная точка входа с заявленными расширенными разрешениями. Не допускается в обычном режиме; проверьте все разрешения.",
+  "settings.plugins.market.retry": "Повторить",
+  "settings.plugins.market.empty": "Каталог пуст. Можно импортировать локальный браузерный плагин.",
+  "settings.plugins.market.emptyReadme": "Этот README пуст.",
+  "settings.plugins.market.search": "Поиск по имени, автору или описанию",
+  "settings.plugins.market.noResults": "Совпадений нет. Измените запрос.",
+  "settings.plugins.market.manifest": "Совместимость и разрешения",
+  "settings.plugins.manager.unbounded": "Более узкая область ресурсов не заявлена. Проверьте фактическую область в запросе разрешения.",
+  "settings.plugins.openView": "Открыть",
+  "settings.plugins.openManager": "Открыть управление плагинами",
+  "settings.plugins.title": "Плагины",
+  "settings.plugins.description": "Управляйте плагинами и просматривайте каталог.",
   'settings.plugins.loading': 'Загрузка настроек плагинов…',
   'settings.plugins.empty': 'Включённые плагины не предоставляют настройки.',
   'settings.plugins.scopeContext': 'Откройте эту настройку в контексте {scope}.',

application/i18n/locales/zh-CN/core.ts

@@ -1150,8 +1150,101 @@ Vaults 标签保持扁平，不使用这块背景。
   'qs.localShells': '本地 Shell',
   'qs.default': '默认',
   'settings.tab.plugins': '插件',
-  'settings.plugins.title': '插件设置',
-  'settings.plugins.description': '由开发插件提供、经 Netcatty 原生组件验证的设置。',
+  "settings.plugins.manager.installed": "已安装插件",
+  "settings.plugins.manager.import": "导入 .ncpkg",
+  "settings.plugins.manager.preview": "导入的插件保持停用，请检查后再启用。",
+  "settings.plugins.manager.empty": "导入本地插件包以开始使用。",
+  "settings.plugins.manager.enabled": "已启用",
+  "settings.plugins.manager.disabled": "已停用",
+  "settings.plugins.manager.enable": "启用",
+  "settings.plugins.manager.disable": "停用",
+  "settings.plugins.manager.remove": "卸载",
+  "settings.plugins.manager.removeNote": "卸载会移除插件代码和本地 KV 数据，保留用户设置、秘密存储和同步 sidecar。",
+  "settings.plugins.permissions.statusUnknown": "状态未知",
+  "plugins.sidebar.extensions": "扩展页面",
+  "plugins.sidebar.selectTerminal": "请先选择已打开的终端。",
+  "plugins.sidebar.loading": "正在加载扩展页面…",
+  "plugins.vault.loading": "正在加载插件页面…",
+  "plugins.vault.extensions": "扩展",
+  "plugins.vault.back": "返回主机",
+  "plugins.interaction.title": "插件请求",
+  "plugins.interaction.sharing": "分享的文本将交给此插件及其已授权的能力（包括网络访问）。读取文本不代表批准新的网络目标。",
+  "plugins.interaction.input": "输入文本",
+  "plugins.interaction.filter": "筛选选项",
+  "plugins.interaction.preview": "剪贴板预览",
+  "plugins.interaction.previewNote": "仅在点击“预览剪贴板”后读取。检查文本后，还需单独确认才能分享给插件。",
+  "plugins.interaction.previewAction": "预览剪贴板",
+  "plugins.interaction.share": "分享给插件",
+  "plugins.interaction.copy": "复制到剪贴板",
+  "plugins.interaction.failed": "此请求已过期或无法完成。",
+  "settings.plugins.permissions.current": "匹配当前运行实例",
+  "settings.plugins.permissions.inactive": "对当前运行实例不生效",
+  "settings.plugins.permissions.title": "已保存的授权",
+  "settings.plugins.permissions.refresh": "刷新",
+  "settings.plugins.permissions.loading": "正在读取授权...",
+  "settings.plugins.permissions.empty": "没有已保存的授权。单次决定不会保留。",
+  "settings.plugins.permissions.always": "直到撤销",
+  "settings.plugins.permissions.application": "直到退出 Netcatty",
+  "settings.plugins.permissions.session": "直到会话关闭",
+  "settings.plugins.permissions.audit": "最近的安全事件（最多 100 条）",
+  "settings.plugins.permissions.revoke": "停用并撤销全部授权",
+  "settings.plugins.permissions.revokeNote": "此操作会停用插件、取消其工作并删除已保存的授权。重新启用后可申请新授权。",
+  "settings.plugins.permissions.unavailable": "插件授权管理不可用",
+  "settings.plugins.manager.permissions": "声明的权限",
+  "settings.plugins.manager.permissionNote": "来自 manifest，不代表已授权。启用表示允许按需激活；必需权限在首次激活前申请，可选权限在用到时申请。敏感操作仍受宿主检查。",
+  "settings.plugins.manager.noPermissions": "未声明特权权限。",
+  "settings.plugins.manager.required": "必需",
+  "settings.plugins.manager.optional": "可选",
+  "settings.plugins.themes.title": "插件主题",
+  "settings.plugins.themes.description": "预览仅影响当前窗口；应用后保存在本设备。个人强调色、字体和终端覆盖设置仍然优先。",
+  "settings.plugins.themes.empty": "当前模式没有已启用的插件主题。",
+  "settings.plugins.themes.choose": "选择主题",
+  "settings.plugins.themes.unavailable": "已保存的主题不可用，正在使用宿主默认配色",
+  "settings.plugins.themes.applied": "已应用",
+  "settings.plugins.themes.preview": "预览",
+  "settings.plugins.themes.apply": "应用",
+  "settings.plugins.themes.cancel": "取消预览",
+  "settings.plugins.themes.restore": "恢复默认",
+  "settings.plugins.themes.invalid": "部分主题配色未通过验证或不可用。",
+  "settings.plugins.themes.failed": "无法应用主题。",
+  "settings.plugins.manager.dataTheme": "主题包：已验证配色，不启动代码运行时。",
+  "settings.plugins.manager.browser": "浏览器运行时：特权访问通过宿主权限代理。",
+  "settings.plugins.manager.advanced": "高级运行时：拥有完整 Node 文件系统和网络能力，代理权限无法限制这些访问。仅供开发预览。",
+  "settings.plugins.manager.data": "本地 KV 仅保留在此设备。只有明确标记为同步的非秘密设置进入加密云 sidecar。插件包和权限授权不参与同步。",
+  "settings.plugins.market.results": "{count} 个插件",
+  "settings.plugins.manager.lastError": "上次记录的错误",
+  "settings.plugins.market.offline": "官方目录暂时不可用，正在显示上次有效目录或内置示例。刷新成功前不能从市场安装。",
+  "settings.plugins.manager.details": "查看详情",
+  "settings.plugins.manager.noDescription": "作者暂未提供功能简介。",
+  "settings.plugins.status": "{count} 项提醒",
+  "settings.plugins.info": "插件说明",
+  "settings.plugins.manager.noVaultShort": "凭据存储不可用",
+  "settings.plugins.market.offlineShort": "目录离线 · 暂不可安装",
+  "settings.plugins.market.readmeInfo": "README 来源说明",
+  "settings.plugins.market.installed": "已安装",
+  "settings.plugins.market.sourceBadge": "源码示例",
+  "settings.plugins.market.title": "插件市场",
+  "settings.plugins.market.note": "精选开源插件。审核不代表安全认证，更新由你手动确认。",
+  "settings.plugins.market.back": "所有插件",
+  "settings.plugins.market.install": "安装此版本（保持停用）",
+  "settings.plugins.market.installNote": "这会替换并停止已安装版本。请在已安装列表检查权限后再启用。",
+  "settings.plugins.market.sourceOnly": "第一方源码示例。请用本地 CLI 构建并导入 .ncpkg；尚未发布可下载发行包。",
+  "settings.plugins.market.readmeNote": "固定到上面的提交。HTML 不执行，远程图片不加载。内容由插件作者提供。",
+  "settings.plugins.manager.noVault": "系统密钥存储不可用。秘密和凭据操作被阻止；浏览市场和不使用秘密的插件仍可使用。",
+  "settings.plugins.manager.sensitive": "敏感访问：授权前请检查涉及的数据和资源范围。",
+  "settings.plugins.manager.dual": "默认使用浏览器运行时，但包中还包含拥有完整设备权限的 Node 入口；仅限开发者模式。",
+  "settings.plugins.manager.advancedDeclaration": "浏览器入口声明了高级权限。不适用于普通浏览器插件模式；请逐项检查声明权限。",
+  "settings.plugins.market.retry": "重试",
+  "settings.plugins.market.empty": "目录暂无插件，仍可导入本地浏览器插件。",
+  "settings.plugins.market.emptyReadme": "README 内容为空。",
+  "settings.plugins.market.search": "搜索名称、作者或描述",
+  "settings.plugins.market.noResults": "没有匹配插件，请尝试其他关键词。",
+  "settings.plugins.market.manifest": "兼容性与权限",
+  "settings.plugins.manager.unbounded": "未声明更细的资源范围。请在权限提示中检查实际授权范围。",
+  "settings.plugins.openView": "打开",
+  "settings.plugins.openManager": "打开插件管理",
+  "settings.plugins.title": "插件",
+  "settings.plugins.description": "管理已安装插件，浏览精选目录。",
   'settings.plugins.loading': '正在加载插件设置…',
   'settings.plugins.empty': '当前没有已启用插件提供设置。',
   'settings.plugins.scopeContext': '请在对应的 {scope} 上下文中打开此设置。',

application/i18n/locales/zh-TW/core.ts

@@ -1153,9 +1153,102 @@ Vaults 分頁維持扁平，不使用這塊背景。
   'qs.default': '預設',
 
   'settings.tab.plugins': '外掛程式',
-  'settings.plugins.title': '外掛程式設定',
-  'settings.plugins.description': '由開發外掛程式提供、經 Netcatty 原生元件驗證的設定。',
+  "settings.plugins.manager.installed": "已安裝插件",
+  "settings.plugins.manager.import": "導入 .ncpkg",
+  "settings.plugins.manager.preview": "導入的插件保持停用，請檢查後再啟用。",
+  "settings.plugins.manager.empty": "導入本地插件包以開始使用。",
+  "settings.plugins.manager.enabled": "已啟用",
+  "settings.plugins.manager.disabled": "已停用",
+  "settings.plugins.manager.enable": "啟用",
+  "settings.plugins.manager.disable": "停用",
+  "settings.plugins.manager.remove": "卸載",
+  "settings.plugins.manager.removeNote": "卸載會移除插件代碼和本地 KV 數據，保留用戶設置、秘密存儲和同步 sidecar。",
+  "settings.plugins.permissions.statusUnknown": "狀態不明",
+  "plugins.sidebar.extensions": "擴充功能頁面",
+  "plugins.sidebar.selectTerminal": "請先選擇已開啟的終端。",
+  "plugins.sidebar.loading": "正在載入擴充功能頁面…",
+  "plugins.vault.loading": "正在載入擴充功能頁面…",
+  "plugins.vault.extensions": "擴充功能",
+  "plugins.vault.back": "返回主機",
+  "plugins.interaction.title": "外掛請求",
+  "plugins.interaction.sharing": "分享的文字會交給此外掛及其已授權能力（包括網路存取）。讀取文字不代表核准新的網路目的地。",
+  "plugins.interaction.input": "輸入文字",
+  "plugins.interaction.filter": "篩選選項",
+  "plugins.interaction.preview": "剪貼簿預覽",
+  "plugins.interaction.previewNote": "僅在點選「預覽剪貼簿」後讀取。檢查文字後，還需另外確認才能分享給外掛。",
+  "plugins.interaction.previewAction": "預覽剪貼簿",
+  "plugins.interaction.share": "分享給外掛",
+  "plugins.interaction.copy": "複製到剪貼簿",
+  "plugins.interaction.failed": "此請求已過期或無法完成。",
+  "settings.plugins.permissions.current": "符合目前執行個體",
+  "settings.plugins.permissions.inactive": "對目前執行個體不生效",
+  "settings.plugins.permissions.title": "已儲存的授權",
+  "settings.plugins.permissions.refresh": "重新整理",
+  "settings.plugins.permissions.loading": "正在讀取授權...",
+  "settings.plugins.permissions.empty": "沒有已儲存的授權。單次決定不會保留。",
+  "settings.plugins.permissions.always": "直到撤銷",
+  "settings.plugins.permissions.application": "直到退出 Netcatty",
+  "settings.plugins.permissions.session": "直到工作階段關閉",
+  "settings.plugins.permissions.audit": "最近的安全事件（最多 100 筆）",
+  "settings.plugins.permissions.revoke": "停用並撤銷全部授權",
+  "settings.plugins.permissions.revokeNote": "此操作會停用外掛、取消其工作並刪除已儲存的授權。重新啟用後可申請新授權。",
+  "settings.plugins.permissions.unavailable": "外掛授權管理無法使用",
+  "settings.plugins.manager.permissions": "聲明的權限",
+  "settings.plugins.manager.permissionNote": "來自 manifest，不代表已授權。啟用表示允許按需激活；必需權限在首次激活前申請，可選權限在用到時申請。敏感操作仍受宿主檢查。",
+  "settings.plugins.manager.noPermissions": "未聲明特權權限。",
+  "settings.plugins.manager.required": "必需",
+  "settings.plugins.manager.optional": "可選",
+  "settings.plugins.themes.title": "外掛主題",
+  "settings.plugins.themes.description": "預覽僅影響目前視窗；套用後儲存於本機。個人強調色、字型和終端覆寫設定仍然優先。",
+  "settings.plugins.themes.empty": "目前模式沒有已啟用的外掛主題。",
+  "settings.plugins.themes.choose": "選擇主題",
+  "settings.plugins.themes.unavailable": "已儲存的主題無法使用，正在使用宿主預設配色",
+  "settings.plugins.themes.applied": "已套用",
+  "settings.plugins.themes.preview": "預覽",
+  "settings.plugins.themes.apply": "套用",
+  "settings.plugins.themes.cancel": "取消預覽",
+  "settings.plugins.themes.restore": "恢復預設",
+  "settings.plugins.themes.invalid": "部分主題配色未通過驗證或無法使用。",
+  "settings.plugins.themes.failed": "無法套用主題。",
+  "settings.plugins.manager.dataTheme": "主題套件：已驗證配色，不啟動程式執行環境。",
+  "settings.plugins.manager.browser": "瀏覽器運行時：特權訪問通過宿主權限代理。",
+  "settings.plugins.manager.advanced": "高級運行時：擁有完整 Node 文件系統和網絡能力，代理權限無法限制這些訪問。僅供開發預覽。",
+  "settings.plugins.manager.data": "本地 KV 僅保留在此設備。只有明確標記為同步的非秘密設置進入加密雲 sidecar。插件包和權限授權不參與同步。",
+  "settings.plugins.manager.unbounded": "未宣告更細的資源範圍。請在權限提示中檢查實際授權範圍。",
+  "settings.plugins.openView": "開啟",
+  "settings.plugins.openManager": "開啟插件管理",
+  "settings.plugins.title": "插件",
+  "settings.plugins.description": "管理已安裝插件，瀏覽精選目錄。",
   'settings.plugins.loading': '正在載入外掛程式設定…',
+  "settings.plugins.market.results": "{count} 個插件",
+  "settings.plugins.manager.lastError": "上次記錄的錯誤",
+  "settings.plugins.market.offline": "官方目錄暫時無法使用，正在顯示上次有效目錄或內建範例。重新整理成功前無法從市場安裝。",
+  "settings.plugins.manager.details": "查看詳情",
+  "settings.plugins.manager.noDescription": "作者尚未提供功能簡介。",
+  "settings.plugins.status": "{count} 項提醒",
+  "settings.plugins.info": "外掛說明",
+  "settings.plugins.manager.noVaultShort": "憑據儲存無法使用",
+  "settings.plugins.market.offlineShort": "目錄離線 · 暫時無法安裝",
+  "settings.plugins.market.readmeInfo": "README 來源說明",
+  "settings.plugins.market.installed": "已安裝",
+  "settings.plugins.market.sourceBadge": "原始碼範例",
+  "settings.plugins.market.title": "插件市場",
+  "settings.plugins.market.note": "精選開源插件。審核不代表安全認證，更新由你手動確認。",
+  "settings.plugins.market.back": "所有插件",
+  "settings.plugins.market.install": "安裝此版本（保持停用）",
+  "settings.plugins.market.installNote": "這會替換並停止已安裝版本。請在已安裝列表檢查權限後再啟用。",
+  "settings.plugins.market.sourceOnly": "第一方源碼示例。請用本地 CLI 構建並導入 .ncpkg；尚未發佈可下載發行包。",
+  "settings.plugins.market.readmeNote": "固定到上面的提交。HTML 不執行，遠程圖片不加載。內容由插件作者提供。",
+  "settings.plugins.manager.noVault": "系統密鑰存儲不可用。秘密和憑據操作被阻止；瀏覽市場和不使用秘密的插件仍可使用。",
+  "settings.plugins.manager.sensitive": "敏感訪問：授權前請檢查涉及的數據和資源範圍。",
+  "settings.plugins.manager.dual": "默認使用瀏覽器運行時，但包中還包含擁有完整設備權限的 Node 入口；僅限開發者模式。",
+  "settings.plugins.manager.advancedDeclaration": "瀏覽器入口聲明瞭高級權限。不適用於普通瀏覽器插件模式；請逐項檢查聲明權限。",
+  "settings.plugins.market.retry": "重試",
+  "settings.plugins.market.empty": "目錄暫無插件，仍可導入本地瀏覽器插件。",
+  "settings.plugins.market.emptyReadme": "README 內容為空。",
+  "settings.plugins.market.search": "搜索名稱、作者或描述",
+  "settings.plugins.market.noResults": "沒有匹配插件，請嘗試其他關鍵詞。",
+  "settings.plugins.market.manifest": "兼容性與權限",
   'settings.plugins.empty': '目前沒有已啟用外掛程式提供設定。',
   'settings.plugins.scopeContext': '請在對應的 {scope} 情境中開啟此設定。',
   'settings.plugins.pressKeybinding': '請按下組合鍵',

application/state/pluginVaultPages.ts

@@ -0,0 +1,27 @@
+export const PLUGIN_VAULT_PAGE_PREFIX = 'plugin-vault:';
+
+export interface PluginVaultPage {
+  key: `plugin-vault:${string}`;
+  pluginId: string;
+  pluginName: string;
+  version: string;
+  viewId: string;
+  title: string;
+  icon?: NetcattyPluginIconReference;
+  order: number;
+}
+
+export function collectPluginVaultPages(plugins: NetcattyPluginContributionSnapshot['plugins']): PluginVaultPage[] {
+  return plugins.flatMap((plugin) => plugin.views
+    .filter((view) => view.location === 'vault-page' && view.visible)
+    .map((view): PluginVaultPage => ({
+      key: `${PLUGIN_VAULT_PAGE_PREFIX}${view.id}`,
+      pluginId: plugin.id, pluginName: plugin.displayName, version: plugin.version,
+      viewId: view.id, title: view.title, icon: view.icon, order: view.order ?? 0,
+    })))
+    .sort((left, right) => left.order - right.order || left.viewId.localeCompare(right.viewId));
+}
+
+export function resolvePluginVaultPage(pages: readonly PluginVaultPage[], section: string): PluginVaultPage | null {
+  return pages.find((page) => page.key === section) ?? null;
+}

application/state/pluginViewOcclusion.ts

@@ -0,0 +1,18 @@
+/** Native child views must yield to host dialogs and overlapping portals. */
+export function isPluginViewOccluded(mount: HTMLElement): boolean {
+  const rect = mount.getBoundingClientRect();
+  if (!mount.isConnected || mount.closest('[hidden], [inert], [aria-hidden="true"]')) return true;
+  const overlays = mount.ownerDocument.querySelectorAll(
+    '[data-app-lock-overlay], [role="dialog"], [role="alertdialog"], '
+    + '[role="menu"][data-state="open"], [data-radix-popper-content-wrapper] > *, [data-native-view-occluder]',
+  );
+  return [...overlays].some((overlay) => {
+    if (mount.contains(overlay)) return false;
+    const style = getComputedStyle(overlay);
+    if (style.display === 'none' || style.visibility === 'hidden' || overlay.closest('[hidden], [inert]')) return false;
+    if (overlay.matches('[data-app-lock-overlay], [role="dialog"][aria-modal="true"], [role="alertdialog"]')) return true;
+    const other = overlay.getBoundingClientRect();
+    return other.width > 0 && other.height > 0 && other.x < rect.right && other.right > rect.x
+      && other.y < rect.bottom && other.bottom > rect.y;
+  });
+}

application/state/settingsStateDefaults.ts

@@ -1,3 +1,4 @@
+import { pluginThemeRegistry } from '../../infrastructure/config/pluginThemeRegistry';
 import {
   DEFAULT_SHIFT_ENTER_NEWLINE_TEXT,
   isLegacyDefaultShiftEnterNewlineText,
@@ -252,6 +253,9 @@ export const applyThemeTokens = (
   accentOverride: string,
 ) => {
   const root = window.document.documentElement;
+  root.toggleAttribute('data-plugin-theme-active', pluginThemeRegistry.isActive(resolvedTheme));
+  const securityVars = buildAppThemeCssVars(pluginThemeRegistry.securityTokens(resolvedTheme), 'theme', '');
+  for (const [key, value] of Object.entries(securityVars)) root.style.setProperty('--host-security' + key.slice(1), value);
   root.classList.remove('light', 'dark');
   root.classList.add(resolvedTheme);
   const cssVars = buildAppThemeCssVars(tokens, accentMode, accentOverride);

application/state/terminalSidePanelTabs.ts

@@ -13,11 +13,11 @@ import {
 } from '../../infrastructure/config/storageKeys';
 import { localStorageAdapter } from '../../infrastructure/persistence/localStorageAdapter';
 import { useToolbarItemLayout } from './useToolbarItemLayout';
-import type { SidePanelTool } from '../../domain/sidePanelLayout';
+import type { BuiltinSidePanelTool, SidePanelTool } from '../../domain/sidePanelLayout';
 
 export type TerminalSidePanelTabId = SidePanelTool;
 
-export const TERMINAL_SIDE_PANEL_TAB_DEFAULT_ORDER: TerminalSidePanelTabId[] = [
+export const TERMINAL_SIDE_PANEL_TAB_DEFAULT_ORDER: BuiltinSidePanelTool[] = [
   'sftp',
   'browser',
   'scripts',

application/state/useActiveChromeTheme.ts

@@ -1,3 +1,6 @@
+import { pluginThemeRegistry } from '../../infrastructure/config/pluginThemeRegistry';
+import { usePluginThemeRevision } from './usePluginThemeRuntime';
+import { useSettingsChromeStore } from './settingsChromeStore';
 import { useLayoutEffect, useRef } from "react";
 import type { TerminalTheme } from "../../domain/models";
 import {
@@ -271,12 +274,15 @@ export function useActiveChromeTheme({
   activeTheme: TerminalTheme | null;
   applyAppTheme: () => void;
 }) {
+  const pluginThemeRevision = usePluginThemeRevision();
+  const { resolvedTheme } = useSettingsChromeStore();
+  const effectiveTheme = pluginThemeRegistry.isActive(resolvedTheme) ? null : activeTheme;
   const applyAppThemeRef = useRef(applyAppTheme);
   applyAppThemeRef.current = applyAppTheme;
 
   useLayoutEffect(() => {
-    syncActiveChromeTheme(activeTheme, applyAppTheme);
-  }, [activeTheme, applyAppTheme]);
+    syncActiveChromeTheme(effectiveTheme, applyAppTheme);
+  }, [effectiveTheme, applyAppTheme, pluginThemeRevision]);
 
   useLayoutEffect(() => {
     return () => {

application/state/useEmbeddedPluginView.ts

@@ -0,0 +1,119 @@
+import { useEffect, useRef, useState } from 'react';
+import { PluginViewLifecycleController, type HostedPluginViewState } from './pluginViewLifecycle';
+import { resolvePluginViewWindowScope } from './pluginViewScopes';
+import { isPluginViewOccluded } from './pluginViewOcclusion';
+import type { UsePluginContributionsResult } from './usePluginContributions';
+
+type ViewAdapter = Pick<UsePluginContributionsResult, 'openView' | 'closeView' | 'focusView' | 'setViewBounds' | 'setViewVisibility' | 'onViewClosed' | 'onViewFocused'>;
+
+/** Host-owned mounting only. No plugin router, DOM, session or vault data API. */
+export function useEmbeddedPluginView({ viewId, version, slot, active, context, adapter, subscribeHidden, unavailable, focused, focusOnReveal = false }: {
+  viewId: string;
+  version: string;
+  slot: string;
+  active: boolean;
+  context: Record<string, unknown>;
+  adapter: ViewAdapter;
+  subscribeHidden(listener: () => void): () => void;
+  unavailable(): void;
+  focused?(): void;
+  focusOnReveal?: boolean;
+}) {
+  const mountRef = useRef<HTMLDivElement>(null);
+  const [loading, setLoading] = useState(true);
+  const adapterRef = useRef(adapter);
+  const unavailableRef = useRef(unavailable);
+  const focusedRef = useRef(focused);
+  const revealFocusRef = useRef(focusOnReveal);
+  const requestFocusRef = useRef<() => void>(() => {});
+  revealFocusRef.current = focusOnReveal;
+  focusedRef.current = focused;
+  adapterRef.current = adapter;
+  unavailableRef.current = unavailable;
+  useEffect(() => {
+    const mount = mountRef.current;
+    if (!active || !mount) return;
+    let cancelled = false;
+    const lifecycle = new PluginViewLifecycleController<HostedPluginViewState>();
+    const instanceId = crypto.randomUUID();
+    const scopeId = resolvePluginViewWindowScope({ pathname: window.location.pathname,
+      search: window.location.search, hash: `${window.location.hash}|plugin-slot:${slot}` });
+    const { openView, closeView, focusView, setViewBounds, setViewVisibility, onViewClosed, onViewFocused } = adapterRef.current;
+    const close = () => {
+      if (cancelled) return;
+      cancelled = true;
+      lifecycle.markViewClosed(viewId);
+      void closeView(instanceId).catch(() => {});
+    };
+    const failCurrent = () => {
+      if (cancelled) return;
+      close();
+      unavailableRef.current();
+    };
+    const unsubscribe = onViewClosed((event) => {
+      lifecycle.handleHostClose(event.instanceId);
+      if (event.instanceId === instanceId && !cancelled) {
+        close();
+        unavailableRef.current();
+      }
+    });
+    const stopOnHide = subscribeHidden(close);
+    const stopOnFocus = onViewFocused((event) => {
+      if (!cancelled && event.instanceId === instanceId) focusedRef.current?.();
+    });
+    const bounds = () => {
+      const rect = mount.getBoundingClientRect();
+      return { x: Math.round(rect.x), y: Math.round(rect.y), width: Math.max(1, Math.round(rect.width)), height: Math.max(1, Math.round(rect.height)) };
+    };
+    let opened = false;
+    let lastBounds = '';
+    let visible = false;
+    const focus = () => {
+      if (!cancelled && opened && visible && revealFocusRef.current && !isPluginViewOccluded(mount)) void focusView(instanceId).catch(() => {});
+    };
+    requestFocusRef.current = focus;
+    const updateVisibility = () => {
+      if (!opened || cancelled) return;
+      const rect = mount.getBoundingClientRect();
+      const next = rect.width > 0 && rect.height > 0 && !isPluginViewOccluded(mount);
+      if (visible === next) return;
+      visible = next;
+      void setViewVisibility(instanceId, next).then(() => { if (next) focus(); }).catch(failCurrent);
+    };
+    const resize = () => {
+      if (opened && !cancelled) {
+        const next = bounds();
+        const key = JSON.stringify(next);
+        if (key !== lastBounds) { lastBounds = key; void setViewBounds(instanceId, next).catch(failCurrent); }
+      }
+      updateVisibility();
+    };
+    const observer = typeof ResizeObserver === 'undefined' ? null : new ResizeObserver(resize);
+    observer?.observe(mount);
+    const mutations = new MutationObserver(resize);
+    mutations.observe(document.body, { childList: true, subtree: true, attributes: true,
+      attributeFilter: ['class', 'style', 'hidden', 'inert', 'role', 'aria-modal', 'aria-hidden', 'data-state', 'data-app-lock-overlay', 'data-radix-popper-content-wrapper', 'data-native-view-occluder'] });
+    window.addEventListener('resize', resize);
+    document.addEventListener('scroll', resize, true);
+    setLoading(true);
+    const opening = lifecycle.beginOpen({ viewKey: viewId });
+    void openView({ viewId, instanceId, scopeId, bounds: bounds(), context }).then(async (result) => {
+      if (cancelled || lifecycle.shouldCloseOpen(opening) || lifecycle.consumeHostClose(result.instanceId)) {
+        await closeView(result.instanceId);
+        return;
+      }
+      opened = true;
+      lifecycle.setCurrent({ id: result.instanceId, viewId, scopeId, retainContextWhenHidden: false });
+      resize();
+      setLoading(false);
+    }).catch(() => {
+      if (!cancelled) { close(); unavailableRef.current(); }
+    }).finally(() => lifecycle.finishOpen({ token: opening, viewKey: viewId }));
+    return () => {
+      close(); unsubscribe(); stopOnHide(); stopOnFocus(); observer?.disconnect(); mutations.disconnect();
+      window.removeEventListener('resize', resize); document.removeEventListener('scroll', resize, true);
+    };
+  }, [active, context, slot, subscribeHidden, version, viewId]);
+  useEffect(() => { if (focusOnReveal) requestFocusRef.current(); }, [focusOnReveal]);
+  return { mountRef, loading };
+}

application/state/usePluginBrandIcon.ts

@@ -0,0 +1,19 @@
+import { useEffect, useState } from 'react';
+import { netcattyBridge } from '../../infrastructure/services/netcattyBridge';
+
+type Raster = { light: string; dark?: string };
+export function usePluginBrandIcon(plugin?: NetcattyInstalledPlugin): Raster | null {
+  const pluginId = plugin?.id;
+  const kind = plugin?.manifest?.icon?.kind;
+  const key = JSON.stringify([pluginId, plugin?.activeVersion, plugin?.archiveSha256, plugin?.runtime?.quarantinedAt, plugin?.manifest?.icon]);
+  const [loaded, setLoaded] = useState<{ key: string; value: Raster | null } | null>(null);
+  useEffect(() => {
+    if (!pluginId || kind !== 'package') return;
+    let cancelled = false;
+    void netcattyBridge.get()?.getPluginBrandIcon?.(pluginId).then((value) => {
+      if (!cancelled) setLoaded({ key, value });
+    }).catch(() => { if (!cancelled) setLoaded({ key, value: null }); });
+    return () => { cancelled = true; };
+  }, [key, pluginId, kind]);
+  return loaded?.key === key ? loaded.value : null;
+}

application/state/usePluginCatalog.test.ts

@@ -0,0 +1,84 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import React from 'react';
+import { act, create, type ReactTestRenderer } from 'react-test-renderer';
+import { usePluginCatalog } from './usePluginCatalog';
+
+function deferred<T>() {
+  let resolve!: (value: T) => void;
+  let reject!: (cause: Error) => void;
+  const promise = new Promise<T>((yes, no) => { resolve = yes; reject = no; });
+  return { promise, resolve, reject };
+}
+
+test('README failures clear on retry/switch and stale requests cannot replace the selected entry', async (context) => {
+  const original = Object.getOwnPropertyDescriptor(globalThis, 'window');
+  const calls: Array<{ id: string; request: ReturnType<typeof deferred<string>> }> = [];
+  Object.defineProperty(globalThis, 'window', { configurable: true, value: {
+    netcatty: {
+      listPluginCatalog: async () => ({ entries: [], source: "builtin", error: null }),
+      getPluginCatalogReadme: (id: string) => { const request = deferred<string>(); calls.push({ id, request }); return request.promise; },
+    },
+  } });
+  (globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT = true;
+  context.after(() => {
+    if (original) Object.defineProperty(globalThis, 'window', original); else Reflect.deleteProperty(globalThis, 'window');
+    Reflect.deleteProperty(globalThis, 'IS_REACT_ACT_ENVIRONMENT');
+  });
+  let state!: ReturnType<typeof usePluginCatalog>;
+  let renders = 0;
+  function Probe({ id }: { id: string }) { state = usePluginCatalog(id); renders++; return null; }
+  let renderer!: ReactTestRenderer;
+  await act(async () => { renderer = create(React.createElement(Probe, { id: 'first' })); });
+  assert.equal(state.readmeStatus, 'loading');
+  await act(async () => calls[0].request.reject(new Error('temporary failure')));
+  assert.equal(state.readmeStatus, 'error');
+  assert.match(state.readmeError!, /temporary failure/);
+  await act(async () => state.retryReadme());
+  assert.equal(state.readmeStatus, 'loading'); assert.equal(state.readmeError, null);
+  await act(async () => calls[1].request.resolve(''));
+  assert.equal(state.readmeStatus, 'ready'); assert.equal(state.readme, ''); assert.equal(state.readmeError, null);
+  await act(async () => state.retryReadme());
+  await act(async () => renderer.update(React.createElement(Probe, { id: 'second' })));
+  assert.equal(state.readmeError, null);
+  await act(async () => calls[3].request.resolve('# Second'));
+  await act(async () => calls[2].request.reject(new Error('stale failure')));
+  assert.equal(state.readme, '# Second'); assert.equal(state.readmeError, null);
+  await act(async () => state.retryReadme());
+  await act(async () => renderer.unmount());
+  const unmountedRenders = renders;
+  await act(async () => calls[4].request.resolve('late content'));
+  assert.equal(renders, unmountedRenders);
+});
+
+test('offline snapshot stays browsable, retry clears warning, and operations bind the selected token', async (context) => {
+  const original = Object.getOwnPropertyDescriptor(globalThis, 'window');
+  const entry = { id: 'com.test.registry', selectionToken: 'first' } as NetcattyPluginCatalogEntry;
+  let offline = true;
+  const reads: unknown[][] = []; const installs: unknown[][] = [];
+  Object.defineProperty(globalThis, 'window', { configurable: true, value: {
+    dispatchEvent() {}, netcatty: {
+      listPluginCatalog: async () => ({ entries: [{ ...entry, selectionToken: offline ? 'first' : 'second' }], source: offline ? 'cached' : 'registry', error: offline ? 'offline' : null }),
+      getPluginCatalogReadme: async (...args: unknown[]) => { reads.push(args); return '# Pinned'; },
+      installCatalogPlugin: async (...args: unknown[]) => { installs.push(args); },
+    },
+  } });
+  (globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT = true;
+  context.after(() => {
+    if (original) Object.defineProperty(globalThis, 'window', original); else Reflect.deleteProperty(globalThis, 'window');
+    Reflect.deleteProperty(globalThis, 'IS_REACT_ACT_ENVIRONMENT');
+  });
+  let state!: ReturnType<typeof usePluginCatalog>;
+  function Probe() { state = usePluginCatalog(entry.id); return null; }
+  let renderer!: ReactTestRenderer;
+  await act(async () => { renderer = create(React.createElement(Probe)); });
+  assert.equal(state.entries.length, 1); assert.equal(state.listStatus, 'ready'); assert.equal(state.listError, 'offline');
+  assert.equal(state.source, 'cached');
+  offline = false;
+  await act(async () => state.retryList());
+  assert.equal(state.listError, null); assert.equal(state.source, 'registry');
+  assert.deepEqual(reads.at(-1), [entry.id, 'second']);
+  await act(async () => state.install(entry.id));
+  assert.deepEqual(installs, [[entry.id, 'second']]);
+  await act(async () => renderer.unmount());
+});

application/state/usePluginCatalog.ts

@@ -0,0 +1,70 @@
+import { useEffect, useRef, useState } from 'react';
+import { netcattyBridge } from '../../infrastructure/services/netcattyBridge';
+
+type ReadmeState = { id: string; token?: string; attempt: number; status: 'loading' | 'ready' | 'error'; text: string; error: string | null };
+export function usePluginCatalog(selectedId: string | null) {
+  const [entries, setEntries] = useState<NetcattyPluginCatalogEntry[]>([]);
+  const [listStatus, setListStatus] = useState<'loading' | 'ready' | 'error'>('loading');
+  const [source, setSource] = useState<NetcattyPluginCatalogSnapshot['source']>('builtin');
+  const [listError, setListError] = useState<string | null>(null);
+  const [listAttempt, setListAttempt] = useState(0);
+  const [readmeState, setReadmeState] = useState<ReadmeState | null>(null);
+  const [readmeAttempt, setReadmeAttempt] = useState(0);
+  const [installError, setInstallError] = useState<{ id: string; message: string } | null>(null);
+  const [busy, setBusy] = useState(false);
+  const installing = useRef(false);
+  const mounted = useRef(false);
+  useEffect(() => { mounted.current = true; return () => { mounted.current = false; }; }, []);
+  useEffect(() => {
+    let active = true;
+    setListStatus('loading'); setListError(null);
+    void (async () => {
+      try {
+        const bridge = netcattyBridge.get();
+        if (!bridge?.listPluginCatalog) throw new Error('Catalog browsing unavailable');
+        const list = await bridge.listPluginCatalog();
+        if (active) { setEntries(list.entries); setSource(list.source); setListError(list.error); setListStatus('ready'); }
+      } catch (cause) { if (active) { setListStatus('error'); setListError(String(cause)); } }
+    })();
+    return () => { active = false; };
+  }, [listAttempt]);
+  const selectionToken = entries.find((entry) => entry.id === selectedId)?.selectionToken;
+  useEffect(() => {
+    if (!selectedId) return;
+    let active = true;
+    const base = { id: selectedId, token: selectionToken, attempt: readmeAttempt, text: '', error: null };
+    setReadmeState({ ...base, status: 'loading' });
+    void (async () => {
+      try {
+        const bridge = netcattyBridge.get();
+        if (!bridge?.getPluginCatalogReadme) throw new Error('README retrieval unavailable');
+        const text = await bridge.getPluginCatalogReadme(selectedId, selectionToken);
+        if (active) setReadmeState({ ...base, status: 'ready', text });
+      } catch (cause) { if (active) setReadmeState({ ...base, status: 'error', error: String(cause) }); }
+    })();
+    return () => { active = false; };
+  }, [selectedId, selectionToken, readmeAttempt]);
+  const currentReadme = readmeState?.id === selectedId && readmeState.token === selectionToken && readmeState.attempt === readmeAttempt ? readmeState : null;
+  return {
+    entries, listStatus, listError, source,
+    readme: currentReadme?.status === 'ready' ? currentReadme.text : null,
+    readmeStatus: currentReadme?.status ?? (selectedId ? 'loading' : 'idle'),
+    readmeError: currentReadme?.error ?? null,
+    error: installError?.id === selectedId ? installError.message : null,
+    busy,
+    retryList: () => setListAttempt((attempt) => attempt + 1),
+    retryReadme: () => setReadmeAttempt((attempt) => attempt + 1),
+    async install(id: string) {
+      if (installing.current) return;
+      installing.current = true;
+      setBusy(true); setInstallError(null);
+      try {
+        const bridge = netcattyBridge.require();
+        if (!bridge.installCatalogPlugin) throw new Error('Catalog installation unavailable');
+        await bridge.installCatalogPlugin(id, entries.find((entry) => entry.id === id)?.selectionToken);
+        window.dispatchEvent(new Event('netcatty:plugin-packages-changed'));
+      } catch (cause) { if (mounted.current) setInstallError({ id, message: String(cause) }); }
+      finally { installing.current = false; if (mounted.current) setBusy(false); }
+    },
+  };
+}

application/state/usePluginContributions.ts

@@ -88,10 +88,12 @@ export interface UsePluginContributionsResult {
   selectSettingPath(kind: 'file' | 'directory', title: string, defaultPath?: string): Promise<string | null>;
   openView(payload: NetcattyPluginViewOpenRequest): Promise<{ instanceId: string }>;
   closeView(instanceId: string): Promise<void>;
+  focusView(instanceId: string): Promise<void>;
   setViewBounds(instanceId: string, bounds: { x: number; y: number; width: number; height: number }): Promise<void>;
   setViewVisibility(instanceId: string, visible: boolean): Promise<void>;
   setEnvironment(environment: NetcattyPluginEnvironment): Promise<void>;
   onViewClosed(callback: (event: NetcattyPluginViewClosedEvent) => void): () => void;
+  onViewFocused(callback: (event: import('@netcatty/plugin-contract').PluginViewFocusEvent) => void): () => void;
 }
 
 export function usePluginContributions(
@@ -196,6 +198,9 @@ export function usePluginContributions(
     if (!bridge?.closePluginView) return;
     await bridge.closePluginView(instanceId);
   }, [bridge]);
+  const focusView = useCallback(async (instanceId: string) => {
+    await bridge?.focusPluginView?.({ instanceId });
+  }, [bridge]);
 
   const setViewBounds = useCallback(async (
     instanceId: string,
@@ -218,6 +223,9 @@ export function usePluginContributions(
   const onViewClosed = useCallback((callback: (event: NetcattyPluginViewClosedEvent) => void) => (
     bridge?.onPluginViewClosed?.(callback) ?? (() => {})
   ), [bridge]);
+  const onViewFocused = useCallback((callback: (event: import('@netcatty/plugin-contract').PluginViewFocusEvent) => void) => (
+    bridge?.onPluginViewFocused?.(callback) ?? (() => {})
+  ), [bridge]);
 
   const currentLoadState = resolvePluginContributionLoadState({
     currentQueryKey: queryKey,
@@ -239,9 +247,11 @@ export function usePluginContributions(
     selectSettingPath,
     openView,
     closeView,
+    focusView,
     setViewBounds,
     setViewVisibility,
     setEnvironment,
     onViewClosed,
+    onViewFocused,
   };
 }

application/state/usePluginHostInteractions.ts

@@ -0,0 +1,53 @@
+import { useCallback, useEffect, useRef, useState } from 'react';
+import type { HostInteractionPrompt, HostInteractionResponse } from '@netcatty/plugin-contract';
+import { netcattyBridge } from '../../infrastructure/services/netcattyBridge';
+
+export function usePluginHostInteractions() {
+  const [prompt, setPrompt] = useState<HostInteractionPrompt | null>(null);
+  const [value, setValue] = useState('');
+  const [error, setError] = useState(false);
+  const [busy, setBusy] = useState(false);
+  const current = useRef<HostInteractionPrompt | null>(null);
+  const pending = useRef(false);
+  useEffect(() => {
+    const bridge = netcattyBridge.get();
+    if (!bridge?.onPluginInteraction || !bridge.setPluginInteractionReady) return;
+    const unsubscribe = bridge.onPluginInteraction((event) => {
+      if ('closed' in event) {
+        if (current.current?.requestId !== event.requestId) return;
+        current.current = null; setPrompt(null);
+      } else {
+        current.current = event; setPrompt(event);
+        setValue(event.request.kind === 'input' ? event.request.initialValue ?? '' : '');
+      }
+      pending.current = false; setBusy(false); setError(false);
+    });
+    void bridge.setPluginInteractionReady(true).catch(() => {});
+    return () => {
+      current.current = null;
+      unsubscribe();
+      void bridge.setPluginInteractionReady?.(false).catch(() => {});
+    };
+  }, []);
+  const respond = useCallback(async (action: HostInteractionResponse['action']) => {
+    const active = current.current;
+    if (!active || pending.current) return;
+    pending.current = true; setBusy(true); setError(false);
+    try {
+      const bridge = netcattyBridge.require();
+      if (!bridge.respondPluginInteraction) throw new Error('Host interactions unavailable');
+      const accepted = await bridge.respondPluginInteraction({
+        requestId: active.requestId, actionToken: active.actionToken, action,
+        ...(action === 'submit' && (active.request.kind === 'input' || active.request.kind === 'quickPick') ? { value } : {}),
+      });
+      if (!accepted && current.current?.actionToken === active.actionToken) {
+        current.current = null; setPrompt(null);
+      }
+    } catch {
+      if (current.current?.actionToken === active.actionToken) setError(true);
+    } finally {
+      if (current.current?.actionToken === active.actionToken) { pending.current = false; setBusy(false); }
+    }
+  }, [value]);
+  return { prompt, value, setValue, error, busy, respond };
+}

application/state/usePluginManager.test.ts

@@ -0,0 +1,39 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import React from 'react';
+import { act, create, type ReactTestRenderer } from 'react-test-renderer';
+import { usePluginManager } from './usePluginManager';
+
+test('failed manager refresh marks previous enabled state unknown until a successful read', async (context) => {
+  const previous = Object.getOwnPropertyDescriptor(globalThis, 'window');
+  const actPrevious = Object.getOwnPropertyDescriptor(globalThis, 'IS_REACT_ACT_ENVIRONMENT');
+  let fail = false;
+  const plugin = { id: 'com.example.synthetic', enabled: true } as NetcattyInstalledPlugin;
+  Object.defineProperty(globalThis, 'IS_REACT_ACT_ENVIRONMENT', { configurable: true, value: true });
+  Object.defineProperty(globalThis, 'window', { configurable: true, value: {
+    addEventListener() {}, removeEventListener() {}, netcatty: {
+      async getPluginRuntimeStatus() { return { available: true }; },
+      async listPlugins() { if (fail) throw new Error('synthetic status read failed'); return [plugin]; },
+    },
+  } });
+  context.after(() => {
+    if (previous) Object.defineProperty(globalThis, 'window', previous); else Reflect.deleteProperty(globalThis, 'window');
+    if (actPrevious) Object.defineProperty(globalThis, 'IS_REACT_ACT_ENVIRONMENT', actPrevious); else Reflect.deleteProperty(globalThis, 'IS_REACT_ACT_ENVIRONMENT');
+  });
+  let state!: ReturnType<typeof usePluginManager>;
+  function Probe() { state = usePluginManager(); return null; }
+  let renderer!: ReactTestRenderer;
+  await act(async () => { renderer = create(React.createElement(Probe)); });
+  try {
+    assert.equal(state.statusKnown, true);
+    assert.equal(state.plugins[0].enabled, true);
+    fail = true;
+    await act(async () => { await assert.rejects(state.refresh(), /synthetic status read failed/); });
+    assert.equal(state.statusKnown, false);
+    assert.match(state.error ?? '', /synthetic status read failed/);
+    fail = false; plugin.enabled = false;
+    await act(async () => { await state.refresh(); });
+    assert.equal(state.statusKnown, true);
+    assert.equal(state.plugins[0].enabled, false);
+  } finally { await act(async () => { renderer.unmount(); }); }
+});

application/state/usePluginManager.ts

@@ -0,0 +1,69 @@
+import { useCallback, useEffect, useRef, useState } from 'react';
+import { netcattyBridge } from '../../infrastructure/services/netcattyBridge';
+
+export function usePluginManager() {
+  const [plugins, setPlugins] = useState<NetcattyInstalledPlugin[]>([]);
+  const [available, setAvailable] = useState(false);
+  const [statusKnown, setStatusKnown] = useState(false);
+  const [credentialStorageAvailable, setCredentialStorageAvailable] = useState<boolean | undefined>();
+  const [busy, setBusy] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const generation = useRef(0);
+  const mutation = useRef(false);
+  const refresh = useCallback(async () => {
+    const current = ++generation.current;
+    try {
+      const bridge = netcattyBridge.get();
+      const status = await bridge?.getPluginRuntimeStatus?.();
+      const list = status?.available ? await bridge?.listPlugins?.() ?? [] : [];
+      if (current !== generation.current) return;
+      setAvailable(status?.available === true);
+      setStatusKnown(true);
+      setCredentialStorageAvailable(status?.credentialStorageAvailable);
+      setPlugins(list);
+    } catch (cause) {
+      if (current === generation.current) {
+        setStatusKnown(false);
+        setError(cause instanceof Error ? cause.message : String(cause));
+      }
+      throw cause;
+    }
+  }, []);
+  useEffect(() => {
+    const update = () => { void refresh().catch((cause) => setError(String(cause))); };
+    update();
+    const unsubscribe = netcattyBridge.get()?.onPluginContributionsChanged?.(update);
+    window.addEventListener('netcatty:plugin-packages-changed', update);
+    const refreshGeneration = generation;
+    return () => { refreshGeneration.current++; unsubscribe?.(); window.removeEventListener('netcatty:plugin-packages-changed', update); };
+  }, [refresh]);
+  const run = useCallback(async (action: (bridge: NetcattyBridge) => Promise<unknown>) => {
+    if (mutation.current) return;
+    mutation.current = true;
+    setBusy(true);
+    setError(null);
+    try { await action(netcattyBridge.require()); }
+    catch (cause) { setError(cause instanceof Error ? cause.message : String(cause)); }
+    finally {
+      try { await refresh(); } catch (cause) { setError(String(cause)); }
+      mutation.current = false;
+      setBusy(false);
+    }
+  }, [refresh]);
+  return {
+    plugins, available, statusKnown, busy, error, credentialStorageAvailable, refresh,
+    importPackage: () => run(async (bridge) => {
+      if (!bridge.selectFile || !bridge.installPluginPackage) throw new Error('Plugin import unavailable');
+      const path = await bridge.selectFile('Import plugin package', undefined, [{ name: 'Netcatty plugin', extensions: ['ncpkg'] }]);
+      if (path) await bridge.installPluginPackage(path, { enable: false });
+    }),
+    setEnabled: (id: string, enabled: boolean) => run(async (bridge) => {
+      if (!bridge.setPluginEnabled) throw new Error('Plugin management unavailable');
+      return bridge.setPluginEnabled(id, enabled);
+    }),
+    uninstall: (id: string) => run(async (bridge) => {
+      if (!bridge.uninstallPlugin) throw new Error('Plugin management unavailable');
+      return bridge.uninstallPlugin(id);
+    }),
+  };
+}

application/state/usePluginTerminalSidebar.ts

@@ -0,0 +1,79 @@
+import { useEffect, useMemo, useRef, useSyncExternalStore } from 'react';
+import { useI18n } from '../i18n/I18nProvider';
+import { toast } from '../../components/ui/toast';
+import { collectSidePanelPanes, isPluginSidePanelTool, type SidePanelLayout } from '../../domain/sidePanelLayout';
+import { activeTabStore, useActiveTabId } from './activeTabStore';
+import { getSidePanelLiveSnapshot, subscribeSidePanelLiveSnapshot } from './sidePanelLiveStore';
+import { usePluginContributions } from './usePluginContributions';
+import { OPEN_PLUGIN_VIEW_EVENT, type OpenPluginViewDetail } from './usePluginViewLifecycle';
+
+export const OPEN_PLUGIN_TERMINAL_SIDEBAR_EVENT = 'netcatty:open-plugin-terminal-sidebar';
+export const PLUGIN_TERMINAL_SIDEBAR_CONTEXT = Object.freeze({ 'netcatty.surface': 'terminal-sidebar' });
+/** Required production view-context projection, not a plugin-facing API. */
+export interface PluginSidebarHostActions {
+  getActiveTerminalSessionId(): string | null;
+  handleSwitchSidePanelTab(tool: import('../../domain/sidePanelLayout').SidePanelTool): void;
+  handleWithdrawPluginSidebarPane(tabId: string, paneId: string, expectedTool: import('../../domain/sidePanelLayout').SidePanelTool): void;
+}
+export interface PluginTerminalSidebarPage {
+  tool: `plugin-view:${string}`;
+  viewId: string;
+  pluginId: string;
+  pluginName: string;
+  version: string;
+  title: string;
+  icon?: NetcattyPluginIconReference;
+  order: number;
+}
+export function collectPluginTerminalSidebarPages(plugins: NetcattyPluginContributionSnapshot['plugins']): PluginTerminalSidebarPage[] {
+  return plugins.flatMap((plugin) => plugin.views.filter((view) => view.location === 'terminal-sidebar' && view.visible)
+    .map((view): PluginTerminalSidebarPage => ({ tool: `plugin-view:${view.id}`, viewId: view.id, pluginId: plugin.id,
+      pluginName: plugin.displayName, version: plugin.version, title: view.title, icon: view.icon, order: view.order ?? 0 })))
+    .sort((a, b) => a.order - b.order || a.viewId.localeCompare(b.viewId));
+}
+export function requestOpenPluginTerminalSidebar(viewId: string, sessionId: string) {
+  window.dispatchEvent(new CustomEvent(OPEN_PLUGIN_TERMINAL_SIDEBAR_EVENT, { detail: { viewId, sessionId } }));
+}
+export function usePluginTerminalSidebar(host: {
+  layouts: ReadonlyMap<string, SidePanelLayout>;
+  getSession(): string | null;
+  isTerminalTab(tabId: string): boolean;
+  select(tool: `plugin-view:${string}`): void;
+  withdraw(tabId: string, paneId: string, tool: `plugin-view:${string}`): void;
+}) {
+  const { locale, t } = useI18n();
+  const activeTabId = useActiveTabId();
+  // Follow workspace focus without subscribing the whole sidebar to cwd/title
+  // or forwarding the host's live session DTO to a plugin.
+  useSyncExternalStore((listener) => subscribeSidePanelLiveSnapshot(true, listener),
+    () => getSidePanelLiveSnapshot(true).focusedSessionId, () => null);
+  const hostRef = useRef(host); hostRef.current = host;
+  const contributions = usePluginContributions({ locale, context: PLUGIN_TERMINAL_SIDEBAR_CONTEXT });
+  const pages = useMemo(() => collectPluginTerminalSidebarPages(contributions.snapshot.plugins), [contributions.snapshot.plugins]);
+  const sessionId = activeTabId && host.isTerminalTab(activeTabId) ? host.getSession() : null;
+  useEffect(() => {
+    const open = (event: Event) => {
+      const detail = (event as CustomEvent<OpenPluginViewDetail & { sessionId?: string }>).detail;
+      const page = pages.find((item) => item.viewId === detail?.viewId);
+      if (!page) return;
+      const tabId = activeTabStore.getActiveTabId();
+      const current = hostRef.current.getSession();
+      if (!hostRef.current.isTerminalTab(tabId) || !current || (detail.sessionId && detail.sessionId !== current)) {
+        toast.info(t('plugins.sidebar.selectTerminal'));
+        return;
+      }
+      hostRef.current.select(page.tool);
+    };
+    window.addEventListener(OPEN_PLUGIN_TERMINAL_SIDEBAR_EVENT, open);
+    window.addEventListener(OPEN_PLUGIN_VIEW_EVENT, open);
+    return () => { window.removeEventListener(OPEN_PLUGIN_TERMINAL_SIDEBAR_EVENT, open); window.removeEventListener(OPEN_PLUGIN_VIEW_EVENT, open); };
+  }, [pages, t]);
+  useEffect(() => {
+    if (contributions.loading) return;
+    const allowed = new Set(pages.map((page) => page.tool));
+    for (const [tabId, layout] of host.layouts) for (const pane of collectSidePanelPanes(layout.root)) {
+      if (isPluginSidePanelTool(pane.tool) && !allowed.has(pane.tool)) host.withdraw(tabId, pane.id, pane.tool);
+    }
+  }, [contributions.loading, host, pages]);
+  return { pages, contributions, tabId: activeTabId, sessionId };
+}

application/state/usePluginThemeRuntime.ts

@@ -0,0 +1,77 @@
+import { useEffect, useSyncExternalStore } from "react";
+import { netcattyBridge } from "../../infrastructure/services/netcattyBridge";
+import { pluginThemeRegistry } from "../../infrastructure/config/pluginThemeRegistry";
+export function usePluginThemeRevision() {
+  return useSyncExternalStore(
+    pluginThemeRegistry.subscribe,
+    pluginThemeRegistry.getRevision,
+    pluginThemeRegistry.getRevision,
+  );
+}
+/** Host-owned selection; never stored in plugin KV or cloud sidecars. */
+let runtimeUsers = 0;
+let disconnectRuntime: (() => void) | undefined;
+function connectRuntime() {
+  const bridge = netcattyBridge.get();
+  let active = true,
+    request = 0;
+  const refresh = async () => {
+    const current = ++request;
+    try {
+      const catalog = await bridge?.getPluginThemes?.();
+      if (active && current === request && catalog)
+        pluginThemeRegistry.setCatalog(catalog);
+    } catch {
+      /* Keep the last host-validated selection; never apply unvalidated data. */
+    }
+  };
+  void refresh();
+  const dispose = bridge?.onPluginThemesChanged?.(() => {
+    pluginThemeRegistry.invalidate();
+    void refresh();
+  });
+  const forced = window.matchMedia?.("(forced-colors: active)"),
+    contrast = window.matchMedia?.("(prefers-contrast: more)");
+  const update = () =>
+    pluginThemeRegistry.setHighContrast(
+      Boolean(forced?.matches || contrast?.matches),
+    );
+  update();
+  forced?.addEventListener?.("change", update);
+  contrast?.addEventListener?.("change", update);
+  return () => {
+    active = false;
+    request++;
+    dispose?.();
+    forced?.removeEventListener?.("change", update);
+    contrast?.removeEventListener?.("change", update);
+  };
+}
+export function usePluginThemeRuntime() {
+  const revision = usePluginThemeRevision();
+  useEffect(() => {
+    if (runtimeUsers++ === 0) disconnectRuntime = connectRuntime();
+    return () => {
+      if (--runtimeUsers === 0) {
+        disconnectRuntime?.();
+        disconnectRuntime = undefined;
+      }
+    };
+  }, []);
+  return revision;
+}
+export async function applyPluginThemeSelection(
+  mode: "light" | "dark",
+  choice: import("@netcatty/plugin-contract").ThemePackChoice | null,
+) {
+  if (choice === null && !pluginThemeRegistry.isActive(mode))
+    return pluginThemeRegistry.getCatalog();
+  const bridge = netcattyBridge.require();
+  if (!bridge.applyPluginTheme) throw new Error("Plugin themes unavailable");
+  const next = await bridge.applyPluginTheme({
+    mode,
+    choice,
+    expectedRevision: pluginThemeRegistry.getCatalog().selection.revision,
+  });
+  return next; // The host change event refreshes every window; never publish a potentially stale apply response.
+}

application/state/usePluginVaultPages.ts

@@ -0,0 +1,47 @@
+import { useCallback, useEffect, useMemo, useRef } from 'react';
+import { activeTabStore, useActiveTabId } from './activeTabStore';
+import { collectPluginVaultPages, PLUGIN_VAULT_PAGE_PREFIX, resolvePluginVaultPage } from './pluginVaultPages';
+import { usePluginContributions } from './usePluginContributions';
+import { OPEN_PLUGIN_VIEW_EVENT, type OpenPluginViewDetail } from './usePluginViewLifecycle';
+
+const CONTEXT = Object.freeze({ 'netcatty.surface': 'vault-page' });
+
+export function usePluginVaultPages({ locale, section, select }: {
+  locale: string;
+  section: string;
+  select(section: 'hosts' | `plugin-vault:${string}`): void;
+}) {
+  const active = useActiveTabId() === 'vault';
+  const sectionRef = useRef(section);
+  const focusFrame = useRef<number | null>(null);
+  sectionRef.current = section;
+  useEffect(() => () => { if (focusFrame.current !== null) cancelAnimationFrame(focusFrame.current); }, []);
+  const contributions = usePluginContributions({ locale, context: CONTEXT });
+  const pages = useMemo(() => collectPluginVaultPages(contributions.snapshot.plugins), [contributions.snapshot.plugins]);
+  const selected = resolvePluginVaultPage(pages, section);
+  const fallback = useCallback(() => {
+    select('hosts');
+    if (focusFrame.current !== null) cancelAnimationFrame(focusFrame.current);
+    focusFrame.current = requestAnimationFrame(() => {
+      focusFrame.current = null;
+      if (sectionRef.current === 'hosts' && activeTabStore.getActiveTabId() === 'vault') {
+        document.querySelector<HTMLButtonElement>('[data-plugin-vault-fallback]')?.focus();
+      }
+    });
+  }, [select]);
+  useEffect(() => {
+    if (!contributions.loading && section.startsWith(PLUGIN_VAULT_PAGE_PREFIX) && !selected) fallback();
+  }, [contributions.loading, fallback, section, selected]);
+  useEffect(() => {
+    const open = (event: Event) => {
+      const detail = (event as CustomEvent<OpenPluginViewDetail>).detail;
+      const page = pages.find((item) => item.viewId === detail?.viewId);
+      if (!page) return;
+      activeTabStore.setActiveTabId('vault');
+      select(page.key);
+    };
+    window.addEventListener(OPEN_PLUGIN_VIEW_EVENT, open);
+    return () => window.removeEventListener(OPEN_PLUGIN_VIEW_EVENT, open);
+  }, [pages, select]);
+  return { pages, selected, active, select, fallback, contributions, context: CONTEXT };
+}

application/state/usePluginViewLifecycle.ts

@@ -82,7 +82,7 @@ export function usePluginViewLifecycle({
   const mountRef = useRef<HTMLDivElement>(null);
   const resolvedActiveView = useMemo(() => viewContributions.snapshot.plugins
     .flatMap((plugin) => plugin.views.map((view) => ({ plugin, view })))
-    .find(({ view }) => view.id === effectiveRequested?.viewId && view.visible) ?? null,
+    .find(({ view }) => view.id === effectiveRequested?.viewId && view.visible && !['vault-page', 'terminal-sidebar'].includes(view.location)) ?? null,
   [effectiveRequested?.viewId, viewContributions.snapshot.plugins]);
   const stableActiveViewRef = useRef<PluginViewSnapshotSelection<ResolvedPluginView> | null>(null);
   const activeView = resolvePluginViewSnapshotSelection({

application/state/useSettingsState.ts

@@ -1,3 +1,4 @@
+import { usePluginThemeRuntime } from './usePluginThemeRuntime';
 import { useCallback, useEffect, useLayoutEffect, useMemo, useRef, useState, type SetStateAction } from 'react';
 
 import { runThemeTransition, type ThemeTransitionMode } from './themeTransition';
@@ -217,6 +218,7 @@ import {
 } from './appearanceSync';
 
 export const useSettingsState = (options: { enableSettingsSync?: boolean; enableSystemEffects?: boolean } = {}) => {
+  const pluginThemeRevision = usePluginThemeRuntime();
   const enableSettingsSync = options.enableSettingsSync !== false;
   const enableSystemEffects = options.enableSystemEffects !== false;
   const initialCustomKeyBindingsRecord =
@@ -1212,7 +1214,7 @@ export const useSettingsState = (options: { enableSettingsSync?: boolean; enable
         notifySettingsChanged(STORAGE_KEY_COLOR, customAccentRecord);
       }
     }
-  }, [theme, resolvedTheme, lightUiThemeId, darkUiThemeId, accentMode, customAccent, customAccentRecord, notifySettingsChanged]);
+  }, [theme, resolvedTheme, lightUiThemeId, darkUiThemeId, accentMode, customAccent, customAccentRecord, notifySettingsChanged, pluginThemeRevision]);
 
   // Listen for OS color scheme changes to keep systemPreference in sync
   useEffect(() => {
@@ -1979,9 +1981,10 @@ export const useSettingsState = (options: { enableSettingsSync?: boolean; enable
   }, [setTerminalSettings]);
 
   const applyAppTheme = useCallback(() => {
+    void pluginThemeRevision; // Invalidate the closure when host theme data changes.
     const tokens = getUiThemeById(resolvedTheme, resolvedTheme === 'dark' ? darkUiThemeId : lightUiThemeId).tokens;
     applyThemeTokens(theme, resolvedTheme, tokens, accentMode, customAccent);
-  }, [theme, resolvedTheme, lightUiThemeId, darkUiThemeId, accentMode, customAccent]);
+  }, [theme, resolvedTheme, lightUiThemeId, darkUiThemeId, accentMode, customAccent, pluginThemeRevision]);
 
   const setEditorWordWrap = useCallback((enabled: boolean) => {
     setEditorWordWrapState(enabled);

components/KeychainManager.tsx

@@ -882,6 +882,7 @@ echo $3 >> "$FILE"`);
       {/* Slide-out Panel */}
       {panel.type !== "closed" && (
         <AsidePanel
+          dataSection="keychain-security-panel"
           open={true}
           onClose={closePanel}
           title={panelTitle}

components/PluginHostInteractionHost.test.tsx

@@ -0,0 +1,91 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { EventEmitter } from 'node:events';
+import { JSDOM } from 'jsdom';
+
+test('host dialog drives choice/input/copy and the two-phase clipboard share using real service action tokens', async () => {
+  const dom = new JSDOM('<!doctype html><html><body><div id="root"></div></body></html>', { pretendToBeVisual: true, url: 'http://localhost' });
+  const previous = new Map<string, PropertyDescriptor | undefined>();
+  const install = (key: string, value: unknown) => {
+    previous.set(key, Object.getOwnPropertyDescriptor(globalThis, key));
+    Object.defineProperty(globalThis, key, { configurable: true, writable: true, value });
+  };
+  for (const key of ['window', 'document', 'navigator', 'HTMLElement', 'HTMLInputElement', 'Element', 'Node', 'NodeFilter', 'MutationObserver', 'CustomEvent', 'Event', 'KeyboardEvent', 'MouseEvent']) {
+    install(key, key === 'window' ? dom.window : dom.window[key as keyof typeof dom.window]);
+  }
+  install('getComputedStyle', dom.window.getComputedStyle.bind(dom.window));
+  install('requestAnimationFrame', dom.window.requestAnimationFrame.bind(dom.window));
+  install('cancelAnimationFrame', dom.window.cancelAnimationFrame.bind(dom.window));
+  install('IS_REACT_ACT_ENVIRONMENT', true);
+  const { default: React, act } = await import('react');
+  const { createRoot } = await import('react-dom/client');
+  const { I18nProvider } = await import('../application/i18n/I18nProvider');
+  const { PluginHostInteractionHost } = await import('./plugins/PluginHostInteractionHost');
+  const { PluginHostInteractionService, assertInteractionRequest } = await import('../electron/plugins/hostInteractionService.cjs');
+  let listener: ((event: unknown) => void) | null = null;
+  let reads = 0;
+  const writes: string[] = [];
+  const audits: unknown[] = [];
+  const sender = Object.assign(new EventEmitter(), { id: 7, isDestroyed: () => false, send(_channel: string, payload: unknown) { listener?.(payload); } });
+  const owner = Object.assign(new EventEmitter(), { webContents: sender, isFocused: () => true, isVisible: () => true, isDestroyed: () => false });
+  const service = new PluginHostInteractionService({
+    getWindow: () => owner, isLocked: () => false,
+    permissionEngine: { onDidRevoke() { return { dispose() {} }; } },
+    database: { recordSecurityAudit(...args: unknown[]) { audits.push(args); } },
+    quotaManager: { chargeBytes() {} },
+    clipboard: { readText() { reads++; return 'synthetic private text'; }, writeText(value: string) { writes.push(value); } },
+  });
+  Object.assign(dom.window, { netcatty: {
+    onPluginInteraction(callback: (event: unknown) => void) { listener = callback; return () => { listener = null; }; },
+    async setPluginInteractionReady(ready: boolean) { return service.setReady(sender, ready); },
+    async respondPluginInteraction(response: unknown) { return service.respond(sender, response); },
+  } });
+  const context = { pluginId: 'com.example.synthetic', pluginVersion: '1.0.0', runtimeId: 'runtime-synthetic', signal: new AbortController().signal, async assertActive() {} };
+  const root = createRoot(document.getElementById('root')!);
+  const settle = () => new Promise((resolve) => setTimeout(resolve, 20));
+  const button = (text: string) => Array.from(document.querySelectorAll<HTMLButtonElement>('button')).find((item) => item.textContent === text)!;
+  const click = async (element: HTMLElement) => { assert.ok(element); await act(async () => { element.click(); await settle(); }); };
+  const begin = async (params: unknown) => {
+    let promise!: Promise<unknown>;
+    await act(async () => { promise = service.request(assertInteractionRequest(params), context); void promise.catch(() => {}); await settle(); });
+    return { promise };
+  };
+  try {
+    await act(async () => root.render(<I18nProvider locale="en"><PluginHostInteractionHost /></I18nProvider>));
+    const choice = await begin({ kind: 'quickPick', title: 'Synthetic choice', items: [{ id: 'compose', label: 'Compose' }] });
+    assert.match(document.querySelector('[role="dialog"]')?.textContent ?? '', /com.example.synthetic/);
+    assert.equal(button('Continue').disabled, true);
+    await click(document.querySelector<HTMLInputElement>('input[type="radio"]')!);
+    await click(button('Continue'));
+    assert.deepEqual(await choice.promise, { cancelled: false, value: 'compose' });
+    await assert.rejects(begin({ kind: 'input', title: 'Invalid hidden newline', initialValue: 'first\nsecond' }), /invalid/);
+    assert.equal(document.querySelector('[role="dialog"]'), null, 'invalid initial text never creates a misleading single-line dialog');
+    const input = await begin({ kind: 'input', title: 'Synthetic input', initialValue: 'synthetic output' });
+    assert.equal(document.querySelector<HTMLInputElement>('input')?.value, 'synthetic output');
+    await click(button('Continue'));
+    assert.deepEqual(await input.promise, { cancelled: false, value: 'synthetic output' });
+    const copy = await begin({ kind: 'clipboard.write', title: 'Copy result', text: 'synthetic output' });
+    assert.deepEqual(writes, []);
+    assert.equal(document.querySelector('textarea')?.value, 'synthetic output');
+    await click(button('Copy to clipboard'));
+    assert.deepEqual(await copy.promise, { cancelled: false, value: true });
+    assert.deepEqual(writes, ['synthetic output']);
+    const share = await begin({ kind: 'clipboard.read', title: 'Share clipboard' });
+    assert.equal(reads, 0);
+    assert.equal(document.querySelector('textarea'), null);
+    await click(button('Preview clipboard'));
+    assert.equal(reads, 1);
+    assert.equal(document.querySelector('textarea')?.value, 'synthetic private text');
+    await click(button('Share with plugin'));
+    assert.deepEqual(await share.promise, { cancelled: false, value: 'synthetic private text' });
+    assert.equal(JSON.stringify(audits).includes('synthetic private text'), false);
+    const cancelled = await begin({ kind: 'clipboard.write', title: 'Cancelled copy', text: 'must not copy' });
+    await click(button('Cancel'));
+    assert.deepEqual(await cancelled.promise, { cancelled: true });
+    assert.deepEqual(writes, ['synthetic output']);
+    assert.equal(service.pending.size, 0);
+  } finally {
+    await act(async () => { root.unmount(); await settle(); }); service.shutdown(); dom.window.close();
+    for (const [key, descriptor] of previous) { if (descriptor) Object.defineProperty(globalThis, key, descriptor); else Reflect.deleteProperty(globalThis, key); }
+  }
+});

components/PluginTerminalSidebar.test.tsx

@@ -0,0 +1,128 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { JSDOM } from 'jsdom';
+
+test('terminal extension pages use actual split panes, focus and session ownership without sharing session data', async () => {
+  const dom = new JSDOM('<!doctype html><html><body><div id="root"></div></body></html>', { pretendToBeVisual: true, url: 'http://localhost' });
+  const previous = new Map<string, PropertyDescriptor | undefined>();
+  const install = (key: string, value: unknown) => {
+    previous.set(key, Object.getOwnPropertyDescriptor(globalThis, key)); Object.defineProperty(globalThis, key, { configurable: true, writable: true, value });
+  };
+  for (const key of ['window', 'document', 'navigator', 'HTMLElement', 'HTMLInputElement', 'Element', 'SVGElement', 'Node', 'NodeFilter', 'MutationObserver', 'CustomEvent', 'Event', 'KeyboardEvent', 'MouseEvent']) {
+    install(key, key === 'window' ? dom.window : dom.window[key as keyof typeof dom.window]);
+  }
+  install('PointerEvent', dom.window.MouseEvent);
+  install('getComputedStyle', dom.window.getComputedStyle.bind(dom.window));
+  install('requestAnimationFrame', dom.window.requestAnimationFrame.bind(dom.window)); install('cancelAnimationFrame', dom.window.cancelAnimationFrame.bind(dom.window)); install('IS_REACT_ACT_ENVIRONMENT', true);
+  let rectX = 200;
+  dom.window.HTMLElement.prototype.getBoundingClientRect = () => new dom.window.DOMRect(rectX, 100, 400, 300);
+  const { default: React, act, useCallback, useRef, useState } = await import('react');
+  const { createRoot } = await import('react-dom/client');
+  const { I18nProvider } = await import('../application/i18n/I18nProvider');
+  const { activeTabStore } = await import('../application/state/activeTabStore');
+  const { sidePanelLiveStore, SIDE_PANEL_INACTIVE_LIVE_SNAPSHOT } = await import('../application/state/sidePanelLiveStore');
+  const { useTerminalSidePanelLayoutState } = await import('../application/state/useTerminalSidePanelLayoutState');
+  const { usePluginTerminalSidebar } = await import('../application/state/usePluginTerminalSidebar');
+  const { PluginTerminalSidebarLauncher, PluginTerminalSidebarPageHost } = await import('./plugins/PluginTerminalSidebar');
+  const { SidePanelLayoutTree } = await import('./terminalLayer/TerminalLayerSidePanelSection');
+  const { PersistentSidePanelPortal } = await import('./terminalLayer/terminalLayerSidePanelSlots');
+  const { collectSidePanelPanes } = await import('../domain/sidePanelLayout');
+  type Tool = import('../domain/sidePanelLayout').SidePanelTool;
+  let selectedSession = 'synthetic-session-a';
+  const getSession = () => selectedSession;
+  const a = { id: 'com.example.sidebar.first', title: 'First page', location: 'terminal-sidebar', entry: 'page.html', visible: true };
+  const b = { ...a, id: 'com.example.sidebar.second', title: 'Second page' };
+  let snapshot = { locale: 'en', plugins: [{ id: 'com.example.sidebar', displayName: 'Synthetic plugin', version: '1.0.0', commands: [], keybindings: [], menus: [], settings: [], views: [a, b] }] };
+  const changed = new Set<() => void>(), focusListeners = new Set<(event: { instanceId: string }) => void>();
+  const opens: NetcattyPluginViewOpenRequest[] = [], closes: string[] = [], focus: string[] = [], bounds: Array<{ instanceId: string; x: number }> = [];
+  const visible = new Map<string, boolean>();
+  Object.assign(dom.window, { netcatty: {
+    async getPluginRuntimeStatus() { return { available: true }; }, async getPluginContributions() { return snapshot; },
+    onPluginContributionsChanged(fn: () => void) { changed.add(fn); return () => { changed.delete(fn); }; },
+    onPluginViewClosed() { return () => {}; },
+    onPluginViewFocused(fn: (event: { instanceId: string }) => void) { focusListeners.add(fn); return () => { focusListeners.delete(fn); }; },
+    async openPluginView(payload: NetcattyPluginViewOpenRequest) { opens.push(payload); return { instanceId: payload.instanceId! }; },
+    async closePluginView(id: string) { closes.push(id); },
+    async setPluginViewBounds(id: string, rect: { x: number }) { bounds.push({ instanceId: id, x: rect.x }); },
+    async setPluginViewVisibility(id: string, value: boolean) { visible.set(id, value); },
+    async focusPluginView(event: { instanceId: string }) { focus.push(event.instanceId); for (const fn of focusListeners) fn(event); },
+  } });
+  let split!: () => void;
+  function Fixture() {
+    const state = useTerminalSidePanelLayoutState(); const latest = useRef(state); latest.current = state;
+    const model = usePluginTerminalSidebar({ layouts: state.sidePanelLayouts, getSession, isTerminalTab: (id) => id === 'workspace-synthetic' || id === 'synthetic-local-terminal',
+      select: (tool) => state.selectSidePanelToolForTab(activeTabStore.getActiveTabId(), tool),
+      withdraw: (tabId, paneId, tool) => {
+        const layout = state.sidePanelLayoutsRef.current.get(tabId);
+        if (layout && collectSidePanelPanes(layout.root).some((pane) => pane.id === paneId && pane.tool === tool)) state.closePane(tabId, paneId);
+      } });
+    const [hosts, setHosts] = useState(new Map<Tool, HTMLElement>()); const parking = useRef<HTMLDivElement>(null);
+    const register = useCallback((tool: Tool, host: HTMLElement | null) => setHosts((prior) => {
+      if ((prior.get(tool) ?? null) === host) return prior;
+      const next = new Map(prior); if (host) next.set(tool, host); else next.delete(tool); return next;
+    }), []);
+    const focusPane = useCallback((id: string) => latest.current.focusPane(activeTabStore.getActiveTabId(), id), []);
+    const closePane = useCallback((id: string) => { latest.current.closePane(activeTabStore.getActiveTabId(), id); }, []);
+    const resize = useCallback(() => {}, []);
+    const layout = model.tabId ? state.sidePanelLayouts.get(model.tabId) : null;
+    const panes = layout ? collectSidePanelPanes(layout.root) : [];
+    split = () => state.splitPane('workspace-synthetic', `plugin-view:${b.id}`, 'vertical', { paneId: 'second-pane', splitId: 'plugin-split' }, 600);
+    return <><PluginTerminalSidebarLauncher sessionId={selectedSession} />
+      {layout && <SidePanelLayoutTree node={layout.root} layout={layout} paneCount={panes.length} labels={new Map(model.pages.map((page) => [page.tool, page.title]))}
+        onClose={closePane} onFocus={focusPane} onHostChange={register} onResize={resize} separator="#777" accent="#4488cc" closePaneLabel="Close pane" resizeLabel="Resize" />}
+      <div ref={parking} hidden aria-hidden="true" />
+      {model.sessionId && panes.map((pane) => {
+        const page = model.pages.find((item) => item.tool === pane.tool); const target = hosts.get(pane.tool) ?? parking.current;
+        if (!page || !target) return null;
+        return <PersistentSidePanelPortal key={`${pane.id}:${model.sessionId}`} portalKey={`plugin-${pane.id}`} target={target}>
+          <PluginTerminalSidebarPageHost page={page} tabId={model.tabId!} sessionId={model.sessionId} getSession={getSession} adapter={model.contributions}
+            focusOnReveal={layout?.focusedPaneId === pane.id} focused={() => focusPane(pane.id)} unavailable={() => closePane(pane.id)} />
+        </PersistentSidePanelPortal>;
+      })}</>;
+  }
+  const root = createRoot(document.getElementById('root')!); const settle = () => new Promise((resolve) => setTimeout(resolve, 40));
+  try {
+    activeTabStore.setActiveTabId('workspace-synthetic'); sidePanelLiveStore.update({ ...SIDE_PANEL_INACTIVE_LIVE_SNAPSHOT, focusedSessionId: selectedSession });
+    await act(async () => { root.render(<I18nProvider locale="en"><Fixture /></I18nProvider>); await settle(); });
+    await act(async () => { document.querySelector<HTMLButtonElement>('button[aria-label="Extension pages"]')!.click(); await settle(); });
+    const firstButton = [...document.querySelectorAll('button')].find((button) => button.textContent?.includes('First page'))!;
+    await act(async () => { firstButton.click(); await settle(); });
+    assert.equal(document.querySelectorAll('[data-section="terminal-side-panel-pane"]').length, 1);
+    assert.ok(document.querySelector('[data-pane-tool] [data-plugin-view-slot="terminal-sidebar"]'));
+    assert.equal(opens.length, 1); assert.deepEqual(opens[0].context, { 'netcatty.surface': 'terminal-sidebar' });
+    await act(async () => { split(); await settle(); });
+    assert.equal(document.querySelectorAll('[data-section="terminal-side-panel-pane"]').length, 2);
+    assert.equal(opens.length, 2);
+    const firstId = opens.find((item) => item.viewId === a.id)!.instanceId!;
+    await act(async () => { for (const fn of focusListeners) fn({ instanceId: firstId }); await settle(); });
+    assert.equal(document.querySelector(`[data-pane-tool="plugin-view:${a.id}"]`)?.getAttribute('data-focused'), 'true');
+    const dialog = document.createElement('div'); dialog.setAttribute('role', 'dialog'); dialog.setAttribute('aria-modal', 'true');
+    await act(async () => { document.body.append(dialog); await settle(); });
+    assert.ok(opens.every((item) => visible.get(item.instanceId!) === false));
+    focus.length = 0;
+    await act(async () => { dialog.remove(); await settle(); });
+    assert.ok(focus.length > 0); assert.ok(focus.every((id) => id === firstId), 'restoring panes focuses only the host-selected pane');
+    const old = opens.map((item) => item.instanceId!);
+    await act(async () => { selectedSession = 'synthetic-session-b'; sidePanelLiveStore.update({ ...SIDE_PANEL_INACTIVE_LIVE_SNAPSHOT, focusedSessionId: selectedSession });
+      assert.ok(old.every((id) => closes.includes(id)), 'workspace focus cancels old native owners synchronously'); await settle(); });
+    assert.equal(opens.length, 4);
+    assert.notEqual(opens[0].scopeId, opens[2].scopeId);
+    assert.ok(opens.every((item) => JSON.stringify(item.context) === JSON.stringify({ 'netcatty.surface': 'terminal-sidebar' })));
+    await act(async () => { rectX = 260; snapshot = { ...snapshot, plugins: [{ ...snapshot.plugins[0], views: [{ ...a, visible: false }, b] }] }; for (const fn of changed) fn(); await settle(); });
+    assert.equal(document.querySelectorAll('[data-section="terminal-side-panel-pane"]').length, 1);
+    assert.equal(document.querySelector('[data-pane-tool]')?.getAttribute('data-pane-tool'), `plugin-view:${b.id}`);
+    assert.ok(bounds.some((item) => item.x === 260), 'portal relocation updates native geometry');
+    const last = opens.at(-1)!.instanceId!;
+    await act(async () => { activeTabStore.setActiveTabId('vault'); assert.ok(closes.includes(last)); await settle(); });
+    assert.equal(document.querySelector('[data-plugin-terminal-sidebar]'), null);
+    await act(async () => { selectedSession = 'synthetic-local-terminal'; activeTabStore.setActiveTabId(selectedSession); await settle(); });
+    await act(async () => { document.querySelector<HTMLButtonElement>('button[aria-label="Extension pages"]')!.click(); await settle(); });
+    const localPage = [...document.querySelectorAll('button')].find((button) => button.textContent?.includes('Second page'))!;
+    await act(async () => { localPage.click(); await settle(); });
+    assert.ok(document.querySelector('[data-plugin-view-slot="terminal-sidebar"]'), 'standalone Local Terminal is a valid navigation owner');
+    assert.deepEqual(opens.at(-1)!.context, { 'netcatty.surface': 'terminal-sidebar' });
+  } finally {
+    await act(async () => { root.unmount(); await settle(); }); dom.window.close();
+    for (const [key, descriptor] of previous) { if (descriptor) Object.defineProperty(globalThis, key, descriptor); else Reflect.deleteProperty(globalThis, key); }
+  }
+});

components/PluginVaultPages.test.tsx

@@ -0,0 +1,101 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { JSDOM } from 'jsdom';
+
+test('Vault navigation mounts a real content slot, yields to host dialogs, and withdraws stale pages', async () => {
+  const dom = new JSDOM('<!doctype html><html><body><div id="root"></div></body></html>', { pretendToBeVisual: true, url: 'http://localhost' });
+  const previous = new Map<string, PropertyDescriptor | undefined>();
+  for (const key of ['window', 'document', 'navigator', 'HTMLElement', 'Element', 'Node', 'MutationObserver', 'CustomEvent', 'Event']) {
+    previous.set(key, Object.getOwnPropertyDescriptor(globalThis, key));
+    Object.defineProperty(globalThis, key, { configurable: true, writable: true, value: key === 'window' ? dom.window : dom.window[key as keyof Window] });
+  }
+  for (const [key, value] of Object.entries({ getComputedStyle: dom.window.getComputedStyle.bind(dom.window),
+    requestAnimationFrame: dom.window.requestAnimationFrame.bind(dom.window), cancelAnimationFrame: dom.window.cancelAnimationFrame.bind(dom.window), IS_REACT_ACT_ENVIRONMENT: true })) {
+    previous.set(key, Object.getOwnPropertyDescriptor(globalThis, key)); Object.defineProperty(globalThis, key, { configurable: true, writable: true, value });
+  }
+  dom.window.HTMLElement.prototype.getBoundingClientRect = () => ({ x: 200, y: 100, width: 640, height: 480, top: 100, left: 200, right: 840, bottom: 580, toJSON() {} });
+  const { default: React, act, useState } = await import('react');
+  const { createRoot } = await import('react-dom/client');
+  const { usePluginVaultPages } = await import('../application/state/usePluginVaultPages');
+  const { PluginVaultNavigation, PluginVaultPage } = await import('./plugins/PluginVaultPages');
+  const { activeTabStore } = await import('../application/state/activeTabStore');
+  const { requestOpenPluginView } = await import('../application/state/usePluginViewLifecycle');
+  const { I18nProvider } = await import('../application/i18n/I18nProvider');
+  const page = { id: 'com.example.page.main', title: 'Synthetic page', location: 'vault-page', entry: 'page.html', visible: true };
+  let snapshot = { locale: 'en', plugins: [{ id: 'com.example.page', version: '1.0.0', displayName: 'Synthetic plugin', commands: [], keybindings: [], menus: [], settings: [], views: [page] }] };
+  let changed: (() => void) | undefined;
+  const listeners = new Set<(event: NetcattyPluginViewClosedEvent) => void>();
+  const opens: NetcattyPluginViewOpenRequest[] = [], closes: string[] = [], visibility: boolean[] = [];
+  let defer: ((value: { instanceId: string }) => void) | undefined;
+  let deferOpen = false;
+  let delayLayout = false;
+  const rejectOldLayout: Array<(error: Error) => void> = [];
+  const layoutResult = () => delayLayout ? new Promise<void>((_resolve, reject) => { rejectOldLayout.push(reject); }) : Promise.resolve();
+  Object.assign(dom.window, { netcatty: {
+    async getPluginRuntimeStatus() { return { available: true }; },
+    async getPluginContributions() { return snapshot; },
+    onPluginContributionsChanged(fn: () => void) { changed = fn; return () => { changed = undefined; }; },
+    onPluginViewClosed(fn: (event: NetcattyPluginViewClosedEvent) => void) { listeners.add(fn); return () => { listeners.delete(fn); }; },
+    async openPluginView(payload: NetcattyPluginViewOpenRequest) { opens.push(payload); return deferOpen ? new Promise<{ instanceId: string }>((resolve) => { defer = resolve; }) : { instanceId: payload.instanceId! }; },
+    async closePluginView(id: string) { closes.push(id); }, async setPluginViewBounds() { await layoutResult(); },
+    async setPluginViewVisibility(_id: string, visible: boolean) { visibility.push(visible); await layoutResult(); },
+  } });
+  let selectSection!: (section: 'hosts' | `plugin-vault:${string}`) => void;
+  function Fixture() {
+    const [section, select] = useState<'hosts' | `plugin-vault:${string}`>('hosts'); selectSection = select;
+    const model = usePluginVaultPages({ locale: 'en', section, select });
+    return <><aside><button data-plugin-vault-fallback onClick={() => select('hosts')}>Hosts</button><PluginVaultNavigation model={model} collapsed={false} /></aside>
+      <main data-section="vault-main">{model.selected ? <PluginVaultPage key={model.selected.key} model={model} /> : <p>Built-in hosts</p>}</main></>;
+  }
+  const root = createRoot(document.getElementById('root')!);
+  const settle = () => new Promise((resolve) => setTimeout(resolve, 35));
+  const clickPage = async () => { await act(async () => { document.querySelector<HTMLButtonElement>('button[aria-label="Synthetic page — Synthetic plugin"]')!.click(); await settle(); }); };
+  try {
+    activeTabStore.setActiveTabId('vault');
+    await act(async () => { root.render(<I18nProvider locale="en"><Fixture /></I18nProvider>); await settle(); });
+    assert.equal(opens.length, 0, 'catalog enumeration does not activate the plugin');
+    await clickPage();
+    assert.ok(document.querySelector('[data-section="vault-main"] [data-plugin-view-slot="vault-page"]'));
+    assert.equal(opens.length, 1);
+    assert.deepEqual(opens[0].context, { 'netcatty.surface': 'vault-page' }, 'no Vault/session data accompanies navigation');
+    assert.equal(visibility.at(-1), true);
+    const dialog = document.createElement('div'); dialog.setAttribute('role', 'dialog'); dialog.setAttribute('aria-modal', 'true');
+    await act(async () => { document.body.append(dialog); await settle(); });
+    assert.equal(visibility.at(-1), false, 'native content yields to host security/settings dialogs');
+    await act(async () => { dialog.remove(); await settle(); });
+    assert.equal(visibility.at(-1), true);
+    await act(async () => { activeTabStore.setActiveTabId('terminal:synthetic'); assert.ok(closes.includes(opens[0].instanceId!)); await settle(); });
+    await act(async () => { activeTabStore.setActiveTabId('vault'); await settle(); });
+    assert.equal(opens.length, 2);
+    await act(async () => { snapshot = { ...snapshot, plugins: [] }; changed?.(); await settle(); });
+    await act(async () => { await settle(); });
+    assert.ok(closes.includes(opens[1].instanceId!));
+    assert.equal(document.querySelector('[data-plugin-vault-page]'), null);
+    assert.equal(document.activeElement?.textContent, 'Hosts');
+    await act(async () => { selectSection('plugin-vault:missing'); await settle(); });
+    assert.match(document.querySelector('main')!.textContent!, /Built-in hosts/);
+    await act(async () => { snapshot = { ...snapshot, plugins: [{ id: 'com.example.page', version: '1.0.0', displayName: 'Synthetic plugin', commands: [], keybindings: [], menus: [], settings: [], views: [page] }] }; changed?.(); await settle(); });
+    deferOpen = true;
+    await act(async () => { requestOpenPluginView({ viewId: page.id }); await settle(); });
+    assert.equal(opens.length, 3);
+    await act(async () => { selectSection('hosts'); await settle(); });
+    assert.ok(closes.includes(opens[2].instanceId!), 'cancel reserved instance before its open response');
+    await act(async () => { defer!({ instanceId: opens[2].instanceId! }); await settle(); });
+    assert.equal(document.querySelector('[data-plugin-vault-page]'), null, 'late open cannot restore withdrawn page');
+    assert.ok(closes.filter((id) => id === opens[2].instanceId).length >= 2, 'late native response is also closed');
+    deferOpen = false;
+    const second = { ...page, id: 'com.example.page.second', title: 'Second page' };
+    await act(async () => { snapshot = { ...snapshot, plugins: [{ ...snapshot.plugins[0], views: [page, second] }] }; changed?.(); await settle(); });
+    delayLayout = true;
+    await clickPage();
+    assert.ok(rejectOldLayout.length >= 2, 'old page has both bounds and visibility IPC in flight');
+    await act(async () => { selectSection('hosts'); await settle(); });
+    delayLayout = false;
+    await act(async () => { document.querySelector<HTMLButtonElement>('button[aria-label="Second page — Synthetic plugin"]')!.click(); await settle(); });
+    await act(async () => { for (const reject of rejectOldLayout) reject(new Error('old page layout failed')); await settle(); });
+    assert.equal(document.querySelector('[data-plugin-vault-page]')?.getAttribute('aria-label'), 'Second page', 'old bounds/visibility failures cannot withdraw the newly selected page');
+  } finally {
+    await act(async () => { root.unmount(); await settle(); }); dom.window.close();
+    for (const [key, descriptor] of previous) { if (descriptor) Object.defineProperty(globalThis, key, descriptor); else Reflect.deleteProperty(globalThis, key); }
+  }
+});

components/QuickSwitcher.pluginContributions.test.tsx

@@ -151,3 +151,24 @@ test('plugin palette items keep repeated placements independently addressable',
     commandId: 'com.example.palette.run',
   }]);
 });
+
+test('packaged Starter contributions are discoverable through the real palette builder', async (context) => {
+  const { createRequire } = await import('node:module');
+  const { mkdtempSync, rmSync } = await import('node:fs');
+  const { tmpdir } = await import('node:os');
+  const { join } = await import('node:path');
+  const require = createRequire(import.meta.url);
+  const { PluginDatabase } = require('../electron/plugins/database.cjs');
+  const { PluginContributionService } = require('../electron/plugins/contributionService.cjs');
+  const manifest = JSON.parse(readFileSync(new URL('../examples/plugins/starter-netcatty/netcatty.plugin.json', import.meta.url), 'utf8'));
+  const root = mkdtempSync(join(tmpdir(), 'starter-palette-'));
+  const database = new PluginDatabase(join(root, 'plugins.sqlite'));
+  context.after(() => { database.close(); rmSync(root, { recursive: true, force: true }); });
+  database.installVersion({ pluginId: manifest.id, version: manifest.version, manifest, archiveSha256: 'a'.repeat(64), packageRelativePath: 'starter' }, { enable: true });
+  const service = new PluginContributionService({ database, runtimeSupervisor: {}, secretStore: {}, getLocale: () => 'en' });
+  const items = buildPluginPaletteItems(service.snapshot().plugins, 'Starter');
+  assert.ok(items.some((item) => item.type === 'plugin-command' && item.commandId === 'com.netcatty.starter.greet'));
+  assert.ok(items.some((item) => item.type === 'plugin-view' && item.id === 'com.netcatty.starter.panel'));
+  database.setEnabled(manifest.id, false);
+  assert.equal(buildPluginPaletteItems(service.snapshot().plugins, 'Starter').length, 0);
+});

components/SettingsPage.tsx

@@ -1,3 +1,5 @@
+import { useAppThemeStyle } from "../application/app/useAppThemeStyle";
+import { selectPluginThemeTokens } from "../application/state/pluginContributionEnvironment";
 /**
  * Settings Page - Standalone settings window content
  * This component is rendered in a separate Electron window
@@ -322,6 +324,9 @@ const SettingsSyncTabWithVault: React.FC<{ onSettingsApplied?: () => void }> = (
 };
 
 const SettingsPageContent: React.FC<{ settings: SettingsState; appLock?: AppLockState }> = ({ settings, appLock }) => {
+    // This publisher also runs in detached Settings: never broadcast a local preview.
+    const committedAppThemeStyle = useAppThemeStyle(false);
+    const pluginThemeTokens = useMemo(() => selectPluginThemeTokens(committedAppThemeStyle as Record<string, unknown>), [committedAppThemeStyle]);
     const { t } = useI18n();
     const { request, clearFocus, openSearch } = useSettingsFocus();
     const { notifyRendererReady, closeSettingsWindow, onWindowCommandCloseRequested } = useWindowControls();
@@ -715,7 +720,7 @@ const SettingsPageContent: React.FC<{ settings: SettingsState; appLock?: AppLock
             </Tabs>
         </div>
         <ExternalMcpApprovalsHost />
-        <PluginContributionHost locale={settings.uiLanguage} theme={settings.resolvedTheme} />
+        <PluginContributionHost locale={settings.uiLanguage} theme={settings.resolvedTheme} themeTokens={pluginThemeTokens} />
         </>
     );
 };

components/TerminalLayer.tsx

@@ -123,6 +123,7 @@ import {
 import { classifyDistroId, hostRestrictsExtraSshChannels, shouldProbeSessionCwd } from '../domain/host';
 import {
   collectSidePanelPanes,
+  isPluginSidePanelTool,
   sidePanelLayoutHasTool,
   type SidePanelLayout,
   type SidePanelSplitDirection,
@@ -1933,6 +1934,16 @@ const TerminalLayerInner: React.FC<TerminalLayerProps> = ({
     resizeSidePanelSplitForTab(tabId, splitId, sizes);
   }, [resizeSidePanelSplitForTab]);
 
+  const handleWithdrawPluginSidebarPane = useCallback((tabId: string, paneId: string, expectedTool: SidePanelTab) => {
+    if (!isPluginSidePanelTool(expectedTool)) return;
+    const layout = sidePanelLayoutsRef.current.get(tabId);
+    const pane = layout && collectSidePanelPanes(layout.root).find((item) => item.id === paneId);
+    if (pane?.tool !== expectedTool) return;
+    setMagnifiedPane((current) => current?.tabId === tabId && current.target.kind === 'side-panel'
+      && current.target.paneId === paneId ? null : current);
+    closeSidePanelPaneForTab(tabId, paneId);
+  }, [closeSidePanelPaneForTab, sidePanelLayoutsRef]);
+
   // Toggle SFTP from activity bar header
   const handleToggleSftpFromBar = useCallback(() => {
     handleSwitchSidePanelTab('sftp');
@@ -2617,6 +2628,9 @@ const TerminalLayerInner: React.FC<TerminalLayerProps> = ({
     handleOpenAI,
     handleOpenSystem,
     handleOpenNotes,
+    getActiveTerminalSessionId,
+    handleSwitchSidePanelTab,
+    handleWithdrawPluginSidebarPane,
     handleOpenBrowser,
     handleFocusSidePanelPane,
     handleMagnifySidePanelPane,

components/VaultView.tsx

@@ -161,6 +161,7 @@ import { VaultViewLayout } from "./vault/VaultViewLayout";
 import { useVaultHostCollections } from "./vault/useVaultHostCollections";
 import { useVaultImportHandlers } from "../application/state/useVaultImportHandlers";
 import { useVaultGroupDragHandlers } from "./vault/useVaultGroupDragHandlers";
+import { usePluginVaultPages } from "../application/state/usePluginVaultPages";
 
 const LazyProtocolSelectDialog = lazy(() => import("./ProtocolSelectDialog"));
 const LazyConnectionLogsManager = lazy(() => import("./ConnectionLogsManager"));
@@ -178,7 +179,8 @@ export type VaultSection =
   | "notes"
   | "port"
   | "knownhosts"
-  | "logs";
+  | "logs"
+  | `plugin-vault:${string}`;
 
 const haveSameHostOrderResult = (previous: Host[], next: Host[]) => {
   if (previous.length !== next.length) return false;
@@ -365,11 +367,12 @@ const VaultViewInner: React.FC<VaultViewProps> = ({
   onVaultFocusRequestHandled,
   terminalSettings,
 }) => {
-  const { t } = useI18n();
+  const { t, locale } = useI18n();
   const rootRef = useRef<HTMLDivElement>(null);
   const hostsRef = useRef(hosts);
   hostsRef.current = hosts;
   const [currentSection, setCurrentSection] = useState<VaultSection>("hosts");
+  const pluginVault = usePluginVaultPages({ locale, section: currentSection, select: setCurrentSection });
   const [search, setSearch] = useState("");
   const [selectedGroupPath, setSelectedGroupPath] = useState<string | null>(
     null,
@@ -1522,6 +1525,7 @@ const VaultViewInner: React.FC<VaultViewProps> = ({
           ContextMenuTrigger,
           Copy,
           currentSection,
+          pluginVault,
           customGroups,
           deleteGroupPath,
           deleteGroupPaths,

components/plugins/PluginBrandIcon.tsx

@@ -0,0 +1,26 @@
+import React, { useState } from 'react';
+import { Package } from 'lucide-react';
+import { usePluginBrandIcon } from '../../application/state/usePluginBrandIcon';
+import { PluginContributionIcon } from './PluginContributionIcon';
+import { resolveCatalogBrandIcon } from './catalogBrandIcons';
+
+export function PluginBrandIcon({ plugin, entry, size = 32, className = '' }: {
+  plugin?: NetcattyInstalledPlugin;
+  entry?: NetcattyPluginCatalogEntry;
+  size?: number;
+  className?: string;
+}) {
+  const manifest = plugin?.manifest ?? entry?.manifest;
+  const icon = manifest?.icon;
+  const key = JSON.stringify([plugin?.id, plugin?.activeVersion, plugin?.archiveSha256, plugin?.runtime?.quarantinedAt, icon]);
+  const loaded = usePluginBrandIcon(plugin);
+  const [failed, setFailed] = useState<string | null>(null);
+  const raster = plugin ? loaded : entry ? resolveCatalogBrandIcon(entry) : null;
+  const imageKey = JSON.stringify([key, raster]);
+  if (icon?.kind === 'theme') return <PluginContributionIcon icon={icon} size={size} className={className} />;
+  if (!raster || failed === imageKey) return <Package size={size} className={className} aria-hidden="true" data-plugin-brand="fallback" />;
+  return <span className={`inline-flex shrink-0 ${className}`} style={{ width: size, height: size }} aria-hidden="true" data-plugin-brand="package">
+    <img src={raster.light} alt="" width={size} height={size} className={raster.dark ? 'h-full w-full object-contain dark:hidden' : 'h-full w-full object-contain'} onError={() => setFailed(imageKey)} />
+    {raster.dark && <img src={raster.dark} alt="" width={size} height={size} className="hidden h-full w-full object-contain dark:block" onError={() => setFailed(imageKey)} />}
+  </span>;
+}

components/plugins/PluginContributionIcon.tsx

@@ -60,7 +60,7 @@ export function PluginContributionIcon({
   const packageIcon = usePluginContributionIcon(pluginId, icon);
 
   if (icon?.kind === 'theme') {
-    const Icon = THEME_ICONS[icon.name] ?? Puzzle;
+    const Icon = Object.hasOwn(THEME_ICONS, icon.name) ? THEME_ICONS[icon.name] : Puzzle;
     return <Icon size={size} className={className} aria-hidden="true" data-plugin-icon-kind="theme" />;
   }
   if (packageIcon) {

components/plugins/PluginHostInteractionHost.tsx

@@ -0,0 +1,54 @@
+import React, { useState } from 'react';
+import { PLUGIN_HOST_INTERACTION_LIMITS } from '@netcatty/plugin-contract';
+import { useI18n } from '../../application/i18n/I18nProvider';
+import { usePluginHostInteractions } from '../../application/state/usePluginHostInteractions';
+import { Button } from '../ui/button';
+import { Input } from '../ui/input';
+import { Dialog, DialogContent, DialogDescription, DialogFooter, DialogHeader, DialogTitle } from '../ui/dialog';
+
+export function PluginHostInteractionHost() {
+  const state = usePluginHostInteractions();
+  if (!state.prompt) return null;
+  return <HostInteractionDialog key={state.prompt.requestId} state={state} prompt={state.prompt} />;
+}
+
+function HostInteractionDialog({ state, prompt }: {
+  state: ReturnType<typeof usePluginHostInteractions>;
+  prompt: NonNullable<ReturnType<typeof usePluginHostInteractions>['prompt']>;
+}) {
+  const { t } = useI18n();
+  const [search, setSearch] = useState('');
+  const request = prompt.request;
+  const previewClipboard = request.kind === 'clipboard.read' && prompt.phase === 'request';
+  const textBytes = new TextEncoder().encode(state.value).length;
+  const canSubmit = request.kind === 'quickPick' ? request.items.some((item) => item.id === state.value) : textBytes <= PLUGIN_HOST_INTERACTION_LIMITS.textBytes;
+  return <Dialog open onOpenChange={(open) => { if (!open) void state.respond('cancel'); }}>
+    <DialogContent className="sm:max-w-[520px]" hideCloseButton>
+      <DialogHeader>
+        <DialogTitle>{t('plugins.interaction.title')}</DialogTitle>
+        <DialogDescription className="break-all">{prompt.pluginId} · {prompt.pluginVersion}</DialogDescription>
+      </DialogHeader>
+      <p className="break-words text-sm font-medium">{request.title}</p>
+      <p className="text-xs text-muted-foreground">{t('plugins.interaction.sharing')}</p>
+      {request.kind === 'input' && <Input aria-label={t('plugins.interaction.input')} value={state.value} maxLength={PLUGIN_HOST_INTERACTION_LIMITS.textBytes} autoComplete="off" autoFocus disabled={state.busy} onChange={(event) => state.setValue(event.target.value)} />}
+      {request.kind === 'quickPick' && <>
+        <Input aria-label={t('plugins.interaction.filter')} value={search} onChange={(event) => setSearch(event.target.value)} autoFocus disabled={state.busy} />
+        <div className="max-h-64 space-y-2 overflow-y-auto" role="radiogroup" aria-label={request.title}>
+          {request.items.filter((item) => `${item.label} ${item.description ?? ''}`.toLocaleLowerCase().includes(search.toLocaleLowerCase())).map((item) => <label key={item.id} className="flex items-start gap-3 rounded-md border p-3">
+            <input type="radio" name="plugin-host-choice" value={item.id} checked={state.value === item.id} disabled={state.busy} onChange={() => state.setValue(item.id)} />
+            <span className="min-w-0 break-words text-sm">{item.label}{item.description && <span className="block text-xs text-muted-foreground">{item.description}</span>}</span>
+          </label>)}
+        </div>
+      </>}
+      {previewClipboard && <p className="text-sm">{t('plugins.interaction.previewNote')}</p>}
+      {(request.kind === 'clipboard.write' || prompt.phase === 'preview') && <textarea aria-label={t('plugins.interaction.preview')} readOnly className="min-h-28 max-h-64 w-full resize-none rounded-md border bg-muted/30 p-3 font-mono text-xs" value={request.kind === 'clipboard.write' ? request.text : prompt.previewText ?? ''} />}
+      {state.error && <p role="alert" className="text-sm text-destructive">{t('plugins.interaction.failed')}</p>}
+      <DialogFooter>
+        <Button variant="outline" disabled={state.busy} onClick={() => void state.respond('cancel')}>{t('common.cancel')}</Button>
+        <Button disabled={state.busy || !canSubmit} onClick={() => void state.respond(previewClipboard ? 'preview' : 'submit')}>
+          {t(previewClipboard ? 'plugins.interaction.previewAction' : request.kind === 'clipboard.read' ? 'plugins.interaction.share' : request.kind === 'clipboard.write' ? 'plugins.interaction.copy' : 'common.continue')}
+        </Button>
+      </DialogFooter>
+    </DialogContent>
+  </Dialog>;
+}

components/plugins/PluginTerminalSidebar.tsx

@@ -0,0 +1,56 @@
+import { useMemo } from 'react';
+import { Blocks } from 'lucide-react';
+import { useI18n } from '../../application/i18n/I18nProvider';
+import { activeTabStore } from '../../application/state/activeTabStore';
+import { subscribeSidePanelLiveSnapshot } from '../../application/state/sidePanelLiveStore';
+import { useEmbeddedPluginView } from '../../application/state/useEmbeddedPluginView';
+import { usePluginContributions } from '../../application/state/usePluginContributions';
+import { collectPluginTerminalSidebarPages, PLUGIN_TERMINAL_SIDEBAR_CONTEXT, requestOpenPluginTerminalSidebar,
+  type PluginTerminalSidebarPage } from '../../application/state/usePluginTerminalSidebar';
+import { PluginContributionIcon } from './PluginContributionIcon';
+import { Button } from '../ui/button';
+import { Popover, PopoverClose, PopoverContent, PopoverTrigger } from '../ui/popover';
+
+export function PluginTerminalSidebarLauncher({ sessionId }: { sessionId: string }) {
+  const { locale, t } = useI18n();
+  const contributions = usePluginContributions({ locale, context: PLUGIN_TERMINAL_SIDEBAR_CONTEXT });
+  const pages = collectPluginTerminalSidebarPages(contributions.snapshot.plugins);
+  if (!pages.length) return null;
+  return <Popover><PopoverTrigger asChild><Button variant="ghost" size="icon" className="h-6 w-6" aria-label={t('plugins.sidebar.extensions')}><Blocks size={14} /></Button></PopoverTrigger>
+    <PopoverContent align="end" className="max-h-80 w-64 overflow-y-auto p-1">
+      <p className="px-2 py-1 text-xs text-muted-foreground">{t('plugins.sidebar.extensions')}</p>
+      {pages.map((page) => <PopoverClose asChild key={page.tool}><button type="button" className="flex w-full items-center gap-2 rounded px-2 py-2 text-left text-sm hover:bg-accent"
+        onClick={() => requestOpenPluginTerminalSidebar(page.viewId, sessionId)}>
+        <PluginContributionIcon pluginId={page.pluginId} icon={page.icon} /><span className="min-w-0"><span className="block truncate">{page.title}</span><span className="block truncate text-xs text-muted-foreground">{page.pluginName}</span></span>
+      </button></PopoverClose>)}
+    </PopoverContent></Popover>;
+}
+
+export function PluginTerminalSidebarPageHost({ page, tabId, sessionId, adapter, getSession, unavailable, focused, focusOnReveal }: {
+  page: PluginTerminalSidebarPage;
+  tabId: string;
+  sessionId: string;
+  adapter: ReturnType<typeof usePluginContributions>;
+  getSession(): string | null;
+  unavailable(): void;
+  focused(): void;
+  focusOnReveal: boolean;
+}) {
+  const { t } = useI18n();
+  const subscribeHidden = useMemo(() => (hide: () => void) => {
+    const stopTab = activeTabStore.subscribeSync((id) => { if (id !== tabId) hide(); });
+    const stopSession = subscribeSidePanelLiveSnapshot(true, () => { if (getSession() !== sessionId) hide(); });
+    return () => { stopTab(); stopSession(); };
+  }, [getSession, sessionId, tabId]);
+  const { mountRef, loading } = useEmbeddedPluginView({ viewId: page.viewId, version: page.version,
+    slot: `terminal-sidebar:${tabId}:${sessionId}`, active: true, context: PLUGIN_TERMINAL_SIDEBAR_CONTEXT,
+    adapter, subscribeHidden, unavailable, focused, focusOnReveal });
+  // The native page never receives these internal ownership IDs. Its state is
+  // scoped by the host; this does not authorize reading the terminal session.
+  return <section className="flex h-full min-h-0 flex-col overflow-hidden" aria-label={`${page.title} — ${page.pluginName}`} data-plugin-terminal-sidebar>
+    <header className="flex h-7 shrink-0 items-center gap-2 border-b border-border px-2 text-xs"><PluginContributionIcon pluginId={page.pluginId} icon={page.icon} size={12} /><span className="truncate">{page.title} · {page.pluginName}</span></header>
+    <div ref={mountRef} className="relative min-h-0 flex-1 overflow-hidden" data-plugin-view-slot="terminal-sidebar">
+      {loading && <p role="status" className="p-3 text-xs text-muted-foreground">{t('plugins.sidebar.loading')}</p>}
+    </div>
+  </section>;
+}

components/plugins/PluginVaultPages.tsx

@@ -0,0 +1,44 @@
+import { activeTabStore } from '../../application/state/activeTabStore';
+import { useI18n } from '../../application/i18n/I18nProvider';
+import { useEmbeddedPluginView } from '../../application/state/useEmbeddedPluginView';
+import type { usePluginVaultPages } from '../../application/state/usePluginVaultPages';
+import { PluginContributionIcon } from './PluginContributionIcon';
+import { Button } from '../ui/button';
+
+type VaultPages = ReturnType<typeof usePluginVaultPages>;
+const subscribeHidden = (hide: () => void) => activeTabStore.subscribeSync((id) => { if (id !== 'vault') hide(); });
+
+export function PluginVaultNavigation({ model, collapsed }: { model: VaultPages; collapsed: boolean }) {
+  const { t } = useI18n();
+  if (!model.pages.length) return null;
+  return <div role="group" aria-label={t('plugins.vault.extensions')} className="mt-3 space-y-1 border-t border-border/50 pt-3">
+    {!collapsed && <p className="px-2 text-xs text-muted-foreground">{t('plugins.vault.extensions')}</p>}
+    {model.pages.map((page) => <Button key={page.key} type="button"
+      variant={model.selected?.key === page.key ? 'secondary' : 'ghost'}
+      className={`w-full ${collapsed ? 'justify-center px-0' : 'justify-start gap-3'}`}
+      title={`${page.title} — ${page.pluginName}`}
+      aria-label={`${page.title} — ${page.pluginName}`}
+      aria-current={model.selected?.key === page.key ? 'page' : undefined}
+      onClick={() => model.select(page.key)}>
+      <PluginContributionIcon pluginId={page.pluginId} icon={page.icon} className="shrink-0" />
+      {!collapsed && <span className="truncate">{page.title}</span>}
+    </Button>)}
+  </div>;
+}
+
+export function PluginVaultPage({ model }: { model: VaultPages }) {
+  const { t } = useI18n();
+  const page = model.selected!;
+  const { mountRef, loading } = useEmbeddedPluginView({ viewId: page.viewId, version: page.version, slot: 'vault-page',
+    active: model.active, context: model.context, adapter: model.contributions, subscribeHidden, unavailable: model.fallback });
+  return <section className="flex min-h-0 flex-1 flex-col" aria-label={page.title} data-plugin-vault-page={page.key}>
+    <header className="app-no-drag flex h-12 shrink-0 items-center justify-between gap-3 border-b border-border px-4">
+      <div className="min-w-0"><h2 className="truncate text-sm font-medium">{page.title}</h2>
+        <p className="truncate text-xs text-muted-foreground">{page.pluginName} · {page.version}</p></div>
+      <Button variant="ghost" onClick={model.fallback}>{t('plugins.vault.back')}</Button>
+    </header>
+    <div ref={mountRef} className="relative min-h-0 flex-1 overflow-hidden" data-plugin-view-slot="vault-page">
+      {loading && <p role="status" className="p-4 text-sm text-muted-foreground">{t('plugins.vault.loading')}</p>}
+    </div>
+  </section>;
+}

components/plugins/catalog-brand-icons.json

@@ -0,0 +1,17 @@
+[
+  {
+    "id": "com.netcatty.starter",
+    "version": "0.1.2",
+    "repository": "binaricat/Netcatty",
+    "commit": "f4a6b205adca486d4e9cda0270e13a9ff0afd7be",
+    "icon": {
+      "kind": "package",
+      "light": "assets/logo-light.png",
+      "dark": "assets/logo-dark.png"
+    },
+    "light": "data:image/png;base64,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",
+    "lightSha256": "ec7bcd5e470ee3d3d9f7f77d120a4de7496a9c0ba984094f84e560d240bea947",
+    "dark": "data:image/png;base64,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",
+    "darkSha256": "7a897a67ae6b652339c77a113d1c759919776fead82d2eefd0238d3c05ba87fe"
+  }
+]

components/plugins/catalogBrandIcons.ts

@@ -0,0 +1,9 @@
+import previews from './catalog-brand-icons.json';
+
+/** Only bundled reviewed assets; catalog data never becomes an image URL. */
+export function resolveCatalogBrandIcon(entry: NetcattyPluginCatalogEntry): { light: string; dark?: string } | null {
+  const preview = previews.find((item) => item.id === entry.id && item.version === entry.version
+    && item.repository === entry.repository && item.commit === entry.commit
+    && JSON.stringify(item.icon) === JSON.stringify(entry.manifest.icon));
+  return preview ? { light: preview.light, dark: preview.dark } : null;
+}

components/settings/tabs/PluginBrandIcon.test.tsx

@@ -0,0 +1,70 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import React from 'react';
+import { act, create, type ReactTestRenderer } from 'react-test-renderer';
+import { renderToStaticMarkup } from 'react-dom/server';
+import { readFileSync } from 'node:fs';
+import { createHash } from 'node:crypto';
+import { inspectPluginBrandIcon } from '@netcatty/plugin-contract';
+import { PluginBrandIcon } from '../../plugins/PluginBrandIcon';
+import { resolveCatalogBrandIcon } from '../../plugins/catalogBrandIcons';
+import previews from '../../plugins/catalog-brand-icons.json';
+
+const preview = previews[0];
+const entry = { ...preview, manifest: { icon: preview.icon } } as unknown as NetcattyPluginCatalogEntry;
+test('reviewed catalog brand previews bind version, source and declaration, never arbitrary URLs', () => {
+  assert.ok(resolveCatalogBrandIcon(entry));
+  const catalog = JSON.parse(readFileSync(new URL('../../../electron/plugins/catalog.json', import.meta.url), 'utf8')) as NetcattyPluginCatalogEntry[];
+  assert.ok(resolveCatalogBrandIcon(catalog.find((item) => item.id === preview.id)!));
+  for (const replacement of [{ version: '9.0.0' }, { commit: '0'.repeat(40) }, { repository: 'untrusted/plugin' }, { manifest: { icon: { kind: 'package', light: 'https://attacker.invalid/a.png' } } }]) {
+    assert.equal(resolveCatalogBrandIcon({ ...entry, ...replacement } as NetcattyPluginCatalogEntry), null);
+  }
+  for (const theme of ['light', 'dark'] as const) {
+    const bytes = Buffer.from(preview[theme].split(',')[1], 'base64');
+    assert.equal(createHash('sha256').update(bytes).digest('hex'), preview[`${theme}Sha256`]);
+    assert.equal(inspectPluginBrandIcon(bytes, preview.icon[theme]).width, 128);
+    assert.deepEqual(bytes, readFileSync(new URL(`../../../examples/plugins/starter-netcatty/${preview.icon[theme]}`, import.meta.url)));
+  }
+  const html = renderToStaticMarkup(<PluginBrandIcon entry={entry} />);
+  assert.match(html, /data-plugin-brand="package"/);
+  assert.match(html, /dark:hidden/);
+  assert.match(html, /dark:block/);
+  assert.doesNotMatch(html, /src="https?:/);
+  assert.match(renderToStaticMarkup(<PluginBrandIcon />), /data-plugin-brand="fallback"/);
+});
+test('installed brand uses metadata only, rejects stale responses, and falls back after image errors', async () => {
+  const oldWindow = Object.getOwnPropertyDescriptor(globalThis, 'window');
+  const previousAct = (globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT;
+  (globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT = true;
+  const requests: Array<(v: { light: string }) => void> = [];
+  Object.defineProperty(globalThis, 'window', { configurable: true, value: { netcatty: { getPluginBrandIcon: () => new Promise((resolve) => requests.push(resolve)) } } });
+  const plugin = { id: 'com.netcatty.starter', enabled: false, activeVersion: '1.0.0', archiveSha256: 'a', runtime: {}, manifest: { icon: preview.icon } } as NetcattyInstalledPlugin;
+  let renderer: ReactTestRenderer | undefined;
+  try {
+    await act(async () => { renderer = create(<PluginBrandIcon plugin={plugin} />); });
+    assert.equal(requests.length, 1);
+    await act(async () => { renderer!.update(<PluginBrandIcon plugin={{ ...plugin, archiveSha256: 'b' }} />); });
+    await act(async () => requests[0]({ light: preview.light }));
+    assert.equal(renderer!.root.findAllByType('img').length, 0);
+    await act(async () => requests[1]({ light: preview.light }));
+    assert.equal(renderer!.root.findAllByType('img').length, 1);
+    await act(async () => renderer!.root.findByType('img').props.onError());
+    assert.equal(renderer!.root.findAllByType('img').length, 0);
+    await act(async () => { renderer!.update(<PluginBrandIcon />); });
+    assert.equal(renderer!.root.findAllByType('img').length, 0);
+  } finally {
+    await act(async () => renderer?.unmount());
+    if (oldWindow) Object.defineProperty(globalThis, 'window', oldWindow); else Reflect.deleteProperty(globalThis, 'window');
+    (globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT = previousAct;
+  }
+});
+
+
+test('disabled brand theme names cannot resolve Object prototype members', () => {
+  for (const name of ['constructor', '__proto__', 'toString', 'valueOf', 'hasOwnProperty']) {
+    const plugin = { id: 'com.test.theme', enabled: false, activeVersion: '1.0.0', runtime: {}, manifest: { icon: { kind: 'theme', name } } } as NetcattyInstalledPlugin;
+    const html = renderToStaticMarkup(<PluginBrandIcon plugin={plugin} />);
+    assert.match(html, /lucide-puzzle/);
+    assert.doesNotMatch(html, /<img/);
+  }
+});

components/settings/tabs/PluginInfo.interaction.test.tsx

@@ -0,0 +1,114 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { JSDOM } from 'jsdom';
+
+test('information previews on hover/focus, pins on click and Escape returns focus without closing the manager', async () => {
+  const dom = new JSDOM('<!doctype html><html><body><div id="root"></div></body></html>', { pretendToBeVisual: true, url: 'http://localhost' });
+  const previous = new Map<string, PropertyDescriptor | undefined>();
+  const install = (key: string, value: unknown) => {
+    previous.set(key, Object.getOwnPropertyDescriptor(globalThis, key));
+    Object.defineProperty(globalThis, key, { configurable: true, writable: true, value });
+  };
+  for (const key of ['window', 'document', 'navigator', 'HTMLElement', 'HTMLInputElement', 'Element', 'Node', 'NodeFilter', 'MutationObserver', 'CustomEvent', 'Event', 'KeyboardEvent', 'MouseEvent']) {
+    install(key, key === 'window' ? dom.window : dom.window[key as keyof typeof dom.window]);
+  }
+  install('getComputedStyle', dom.window.getComputedStyle.bind(dom.window));
+  install('requestAnimationFrame', dom.window.requestAnimationFrame.bind(dom.window));
+  install('cancelAnimationFrame', dom.window.cancelAnimationFrame.bind(dom.window));
+  install('IS_REACT_ACT_ENVIRONMENT', true);
+  const { default: React, act, useState } = await import('react');
+  const { createRoot } = await import('react-dom/client');
+  const { PluginInfo } = await import('./PluginInfo');
+  const { PluginManagementDialog } = await import('./PluginManagementDialog');
+  const { I18nProvider } = await import('../../../application/i18n/I18nProvider');
+  const root = createRoot(document.getElementById('root')!);
+  const settle = (ms = 60) => new Promise((resolve) => setTimeout(resolve, ms));
+  try {
+    await act(async () => root.render(<I18nProvider locale="en"><PluginManagementDialog><PluginInfo label="Plugin help">Packages remain disabled until reviewed.</PluginInfo><button data-other>Other control</button></PluginManagementDialog></I18nProvider>));
+    await act(async () => { document.querySelector<HTMLButtonElement>('button')!.click(); await settle(); });
+    const trigger = document.querySelector<HTMLButtonElement>('button[aria-label="Plugin help"]')!;
+    const other = document.querySelector<HTMLButtonElement>('[data-other]')!;
+    assert.ok(trigger); assert.equal(trigger.getAttribute('title'), null, 'not a native title-only hint');
+    await act(async () => { other.focus(); await settle(); });
+    const hover = new MouseEvent('pointermove', { bubbles: true });
+    Object.defineProperty(hover, 'pointerType', { value: 'mouse' });
+    await act(async () => { trigger.dispatchEvent(hover); await settle(260); });
+    assert.match(document.querySelector('[role="tooltip"]')?.textContent ?? '', /Packages remain disabled/);
+    await act(async () => { trigger.focus(); await settle(); });
+    assert.ok(document.querySelector('[role="tooltip"]'));
+    await act(async () => { trigger.click(); await settle(); });
+    const pinned = document.querySelector<HTMLElement>('[role="dialog"][aria-label="Plugin help"]');
+    assert.ok(pinned, 'click exposes a persistent readable popover');
+    assert.equal(document.querySelector('[role="tooltip"]'), null);
+    await act(async () => { pinned.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape', bubbles: true, cancelable: true })); await settle(); });
+    assert.equal(document.querySelector('[role="dialog"][aria-label="Plugin help"]'), null);
+    assert.equal(document.querySelectorAll('[role="dialog"]').length, 1, 'Escape closes only the information layer');
+    assert.equal(document.activeElement, trigger);
+    assert.equal(Boolean(document.querySelector('[role="tooltip"]')), false, 'Escape does not immediately reopen the focus preview');
+    await act(async () => { other.focus(); trigger.focus(); await settle(); });
+    assert.ok(document.querySelector('[role="tooltip"]'), 'a subsequent deliberate focus still previews help');
+
+    const { PluginMarketplaceContent } = await import('./PluginMarketplace');
+    const entry = { id: 'com.example.guide', name: 'Guide', author: 'Example', version: '1.0.0', license: 'MIT', repository: 'example/plugin', commit: 'a'.repeat(40), description: 'Synthetic metadata',
+      manifest: { id: 'com.example.guide', name: 'Guide', publisher: 'Example', main: { browser: 'index.js' }, engines: { netcatty: '*', api: '0.1.0-internal' } },
+    } as NetcattyPluginCatalogEntry;
+    const catalog = { entries: [entry], source: 'registry', listStatus: 'ready', listError: null, readme: '# Guide', readmeStatus: 'ready', readmeError: null, error: null, busy: false, retryList() {}, retryReadme() {}, async install() {} } as ReturnType<typeof import('../../../application/state/usePluginCatalog').usePluginCatalog>;
+    function Browser() {
+      const [selected, setSelected] = useState<string | null>(null);
+      const [toolbar, setToolbar] = useState<HTMLDivElement | null>(null);
+      return <I18nProvider locale="en"><div data-toolbar ref={setToolbar} /><div data-settings-scroll-pane><PluginMarketplaceContent catalog={catalog} installed={[]} selected={selected} onSelect={setSelected} toolbarContainer={toolbar} /></div></I18nProvider>;
+    }
+    await act(async () => { root.render(<Browser />); await settle(); });
+    const pane = document.querySelector<HTMLElement>('[data-settings-scroll-pane]')!;
+    assert.match(document.querySelector('[data-toolbar]')?.textContent ?? '', /Refresh/);
+    pane.scrollTop = 450;
+    await act(async () => { document.querySelector<HTMLButtonElement>('[data-plugin-id]')!.click(); await settle(); });
+    assert.equal(document.querySelector('.plugin-marketplace-catalog'), null, 'detail replaces the candidate list');
+    assert.doesNotMatch(document.querySelector('[data-toolbar]')?.textContent ?? '', /Refresh/, 'list refresh stays out of detail');
+    assert.equal(pane.scrollTop, 0);
+    assert.equal(document.activeElement?.tagName, 'H4');
+    assert.equal(document.activeElement?.textContent, 'Guide');
+    const back = Array.from(document.querySelectorAll('button')).find((button) => button.textContent?.includes('All plugins'))!;
+    await act(async () => { back.click(); await settle(); });
+    assert.equal(pane.scrollTop, 450);
+    assert.equal(document.activeElement?.getAttribute('data-plugin-id'), entry.id);
+    assert.match(document.querySelector('[data-toolbar]')?.textContent ?? '', /Refresh/);
+
+    const { PluginStatus } = await import('./PluginStatus');
+    function StatusHarness() {
+      const [offline, setOffline] = useState(true);
+      const [noVault, setNoVault] = useState(true);
+      return <I18nProvider locale="en"><PluginStatus noVault={noVault} offlineError={offline ? 'Network unavailable' : null} retry={() => setOffline(false)} /><button onClick={() => setNoVault(false)}>Restore vault</button></I18nProvider>;
+    }
+    await act(async () => { root.render(<StatusHarness />); await settle(); });
+    const status = document.querySelector<HTMLButtonElement>('button[aria-label$="Notices: 2"]')!;
+    await act(async () => { status.focus(); await settle(); });
+    assert.match(document.querySelector('[role="tooltip"]')?.textContent ?? '', /Network unavailable/);
+    assert.equal(document.querySelector('[role="tooltip"] button'), null, 'hover preview never contains an interactive Retry');
+    await act(async () => { status.click(); await settle(); });
+    const retry = document.querySelector<HTMLButtonElement>('[role="dialog"] button')!;
+    assert.equal(retry.textContent, 'Retry');
+    assert.equal(status.textContent, '2', 'only the number badge is visible, not a second text label');
+    assert.equal(document.querySelectorAll('button[aria-label*="Notices:"]').length, 1);
+    assert.match(document.querySelector('[role="dialog"]')?.textContent ?? '', /Updates are manual/);
+    assert.ok(document.querySelector('[role="dialog"] hr'));
+    await act(async () => { retry.click(); await settle(); });
+    assert.ok(document.querySelector('button[aria-label$="Notices: 1"]'));
+    assert.doesNotMatch(document.querySelector('[role="dialog"]')?.textContent ?? '', /Network unavailable/);
+    await act(async () => { document.querySelector('[role="dialog"]')!.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape', bubbles: true, cancelable: true })); await settle(); });
+    assert.match(document.activeElement?.getAttribute('aria-label') ?? '', /Notices: 1$/);
+    await act(async () => { Array.from(document.querySelectorAll('button')).find((button) => button.textContent === 'Restore vault')!.click(); await settle(); });
+    const healthy = document.querySelector<HTMLButtonElement>('button[aria-label="Plugin information"]')!;
+    assert.ok(healthy, 'one information control remains when healthy');
+    assert.equal(healthy.querySelector('span[aria-hidden="true"]'), null, 'healthy control has no count badge');
+    await act(async () => { healthy.click(); await settle(); });
+    assert.match(document.querySelector('[role="dialog"]')?.textContent ?? '', /Updates are manual/);
+    await act(async () => { document.querySelector('[role="dialog"]')!.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape', bubbles: true, cancelable: true })); await settle(); });
+  } finally {
+    await act(async () => root.unmount());
+    dom.window.close();
+    for (const [key, descriptor] of previous) {
+      if (descriptor) Object.defineProperty(globalThis, key, descriptor); else Reflect.deleteProperty(globalThis, key);
+    }
+  }
+});

components/settings/tabs/PluginInfo.tsx

@@ -0,0 +1,25 @@
+import React, { useRef, useState } from 'react';
+import { Info } from 'lucide-react';
+import { Button } from '../../ui/button';
+import { Popover, PopoverContent, PopoverTrigger } from '../../ui/popover';
+import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from '../../ui/tooltip';
+
+/** Hover/focus previews explanatory text; click pins it in the existing accessible popover. */
+export function PluginInfo({ label, children, badgeCount, previewContent }: { label: string; children: React.ReactNode; badgeCount?: number; previewContent?: React.ReactNode }) {
+  const [pinned, setPinned] = useState(false);
+  const [preview, setPreview] = useState(false);
+  const suppressFocusPreview = useRef(false);
+  return <Popover open={pinned} onOpenChange={(open) => { setPinned(open); setPreview(false); }}>
+    <TooltipProvider delayDuration={200}>
+      <Tooltip open={!pinned && preview} onOpenChange={(open) => { if (!open || !suppressFocusPreview.current) setPreview(open); }}>
+        <TooltipTrigger asChild><PopoverTrigger asChild>
+          <Button type="button" variant="ghost" size="sm" className="relative h-8 w-8 shrink-0 p-0 text-muted-foreground focus-visible:ring-2 focus-visible:ring-ring" aria-label={label} onBlur={() => { suppressFocusPreview.current = false; }} onPointerMove={() => { suppressFocusPreview.current = false; }}>
+            <Info size={15} />{Boolean(badgeCount) && <span aria-hidden="true" className="absolute right-0 top-0 flex h-3.5 min-w-3.5 items-center justify-center rounded-full bg-muted px-0.5 text-[9px] font-medium leading-none text-foreground">{badgeCount}</span>}
+          </Button>
+        </PopoverTrigger></TooltipTrigger>
+        <TooltipContent className="max-w-xs space-y-2 bg-popover p-3 text-xs leading-5 text-popover-foreground shadow-sm">{previewContent ?? children}</TooltipContent>
+      </Tooltip>
+    </TooltipProvider>
+    <PopoverContent onEscapeKeyDown={() => { suppressFocusPreview.current = true; }} aria-label={label} align="end" className="max-w-xs space-y-2 text-xs leading-5">{children}</PopoverContent>
+  </Popover>;
+}

components/settings/tabs/PluginInstalledGrid.test.tsx

@@ -0,0 +1,63 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import React from 'react';
+import { act, create, type ReactTestRenderer } from 'react-test-renderer';
+import { I18nProvider } from '../../../application/i18n/I18nProvider';
+import { PluginPackageManager } from './PluginPackageManager';
+import type { usePluginManager } from '../../../application/state/usePluginManager';
+
+test('installed grid filters, opens one detail and restores search, scroll and card focus without pill navigation', async () => {
+  const globals = globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean };
+  const previous = globals.IS_REACT_ACT_ENVIRONMENT; globals.IS_REACT_ACT_ENVIRONMENT = true;
+  const raf = globalThis.requestAnimationFrame;
+  const frames: FrameRequestCallback[] = [];
+  globalThis.requestAnimationFrame = (fn) => { frames.push(fn); return frames.length; };
+  const selections: unknown[] = []; const toggles: unknown[] = []; const focus: string[] = [];
+  const pane = { scrollTop: 160 };
+  const plugins = ['Alpha', 'Beta'].map((name) => ({ id: `com.test.${name.toLowerCase()}`, enabled: false, activeVersion: '1.0.0',
+    manifest: { name, publisher: 'Example', description: `${name} safely formats synthetic greetings without accessing hosts or secrets.`, license: 'MIT', main: { browser: 'index.js' }, engines: { api: '0.1.0-internal', netcatty: '*' } },
+    runtime: { lastError: name === 'Beta' ? 'Incompatible version' : null },
+  })) as NetcattyInstalledPlugin[];
+  const manager = { available: true, plugins, busy: false, setEnabled: async (...args: unknown[]) => { toggles.push(args); } } as unknown as ReturnType<typeof usePluginManager>;
+  let renderer!: ReactTestRenderer;
+  try {
+    await act(async () => { renderer = create(<I18nProvider locale="en"><PluginPackageManager manager={manager} onSelectionChange={(id) => selections.push(id)} /></I18nProvider>, {
+      createNodeMock: (element) => element.type === 'section' ? {
+        closest: () => pane,
+        querySelector: () => ({ focus: () => focus.push('detail') }),
+        querySelectorAll: () => plugins.map((plugin) => ({ dataset: { pluginCard: plugin.id }, focus: () => focus.push(plugin.id) })),
+      } : null,
+    }); });
+    const cards = () => renderer.root.findAllByType('button').filter((node) => node.props['data-plugin-card']);
+    assert.equal(cards().length, 2);
+    const alphaCard = renderer.root.findAllByType('article')[0];
+    assert.match(JSON.stringify(renderer.toJSON()), /Alpha safely formats synthetic greetings/);
+    assert.ok(alphaCard.findAllByType('p').some((node) => node.children.includes('Example')), 'author has its own line');
+    assert.ok(alphaCard.findAllByType('p').some((node) => node.props.className?.includes('line-clamp-3')), 'card description is bounded');
+    assert.match(JSON.stringify(renderer.toJSON()), /MIT/);
+    assert.match(JSON.stringify(renderer.toJSON()), /Incompatible version/);
+    assert.ok(renderer.root.findAllByType('div').some((node) => node.props.className?.includes('repeat(auto-fill')));
+    const pill = renderer.root.findAllByType('button').find((node) => node.props['aria-pressed'] !== undefined)!;
+    await act(async () => pill.props.onClick());
+    assert.deepEqual(toggles, [[plugins[0].id, true]]); assert.deepEqual(selections, []);
+    await act(async () => renderer.root.findByType('input').props.onChange({ target: { value: 'Alpha' } }));
+    assert.equal(cards().length, 1);
+    await act(async () => cards()[0].props.onClick()); frames.splice(0).forEach((fn) => fn(0));
+    assert.deepEqual(selections, [plugins[0].id]); assert.equal(pane.scrollTop, 0); assert.equal(focus.at(-1), 'detail');
+    assert.equal(renderer.root.findAllByType('input').length, 0);
+    assert.match(JSON.stringify(renderer.toJSON()), /Declared permissions/);
+    assert.ok(renderer.root.findByType('article').findAllByType('p').some((node) => node.props.className?.includes('whitespace-pre-wrap')), 'detail shows the complete description');
+    const back = renderer.root.findAllByType('button').find((node) => node.children.includes('Installed plugins'))!;
+    await act(async () => back.props.onClick()); frames.splice(0).forEach((fn) => fn(0));
+    assert.equal(renderer.root.findByType('input').props.value, 'Alpha'); assert.equal(cards().length, 1);
+    assert.equal(pane.scrollTop, 160); assert.equal(focus.at(-1), plugins[0].id);
+    await act(async () => renderer.root.findByType('input').props.onChange({ target: { value: 'none' } }));
+    assert.equal(cards().length, 0);
+    await act(async () => renderer.root.findByType('input').props.onChange({ target: { value: '' } }));
+    await act(async () => renderer.update(<I18nProvider locale="en"><PluginPackageManager manager={{ ...manager, statusKnown: false, error: 'synthetic state unavailable' }} onSelectionChange={(id) => selections.push(id)} /></I18nProvider>));
+    const unknown = renderer.root.findAllByType('button').filter((node) => node.children.includes('Status unknown'));
+    assert.equal(unknown.length, 2);
+    assert.ok(unknown.every((node) => node.props.disabled === true && node.props['aria-pressed'] === undefined));
+    await act(async () => renderer.unmount());
+  } finally { globals.IS_REACT_ACT_ENVIRONMENT = previous; globalThis.requestAnimationFrame = raf; }
+});

components/settings/tabs/PluginManagementDialog.interaction.test.tsx

@@ -0,0 +1,80 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { JSDOM } from 'jsdom';
+
+// Exercise the real Radix portal/focus lifecycle, rather than a mocked Dialog.
+test('plugin manager is single-instance, closes with Escape, restores focus and remounts on reopen', async () => {
+  const dom = new JSDOM('<!doctype html><html><body><div id="root"></div></body></html>', { pretendToBeVisual: true, url: 'http://localhost' });
+  const previous = new Map<string, PropertyDescriptor | undefined>();
+  const install = (key: string, value: unknown) => {
+    previous.set(key, Object.getOwnPropertyDescriptor(globalThis, key));
+    Object.defineProperty(globalThis, key, { configurable: true, writable: true, value });
+  };
+  for (const key of ['window', 'document', 'navigator', 'HTMLElement', 'HTMLInputElement', 'Element', 'Node', 'NodeFilter', 'MutationObserver', 'CustomEvent', 'Event', 'KeyboardEvent', 'MouseEvent']) {
+    install(key, key === 'window' ? dom.window : dom.window[key as keyof typeof dom.window]);
+  }
+  install('getComputedStyle', dom.window.getComputedStyle.bind(dom.window));
+  install('requestAnimationFrame', dom.window.requestAnimationFrame.bind(dom.window));
+  install('cancelAnimationFrame', dom.window.cancelAnimationFrame.bind(dom.window));
+  install('IS_REACT_ACT_ENVIRONMENT', true);
+  const { default: React, act, useEffect } = await import('react');
+  const { createRoot } = await import('react-dom/client');
+  const { I18nProvider } = await import('../../../application/i18n/I18nProvider');
+  const { PluginManagementDialog } = await import('./PluginManagementDialog');
+  const root = createRoot(document.getElementById('root')!);
+  let mounts = 0;
+  let unmounts = 0;
+  function Content() {
+    useEffect(() => { mounts++; return () => { unmounts++; }; }, []);
+    return <input aria-label="Plugin search" defaultValue="" />;
+  }
+  const settle = () => new Promise((resolve) => setTimeout(resolve, 20));
+  const click = async (element: HTMLElement) => { await act(async () => { element.click(); await settle(); }); };
+  try {
+    await act(async () => { root.render(<I18nProvider locale="en"><PluginManagementDialog><Content /></PluginManagementDialog></I18nProvider>); });
+    const trigger = document.querySelector<HTMLButtonElement>('button')!;
+    assert.equal(document.querySelector('[role="dialog"]'), null);
+    assert.equal(mounts, 0, 'closed settings entry does not mount manager subscriptions');
+    trigger.focus();
+    await click(trigger);
+    assert.equal(document.querySelectorAll('[role="dialog"]').length, 1);
+    assert.equal(mounts, 1);
+    assert.equal(document.activeElement?.getAttribute('aria-label'), 'Plugin search');
+    assert.equal(document.querySelector('[role="dialog"]')?.contains(document.querySelector('[data-settings-scroll-pane]')), true);
+    await act(async () => { root.render(<I18nProvider locale="en"><PluginManagementDialog><Content /></PluginManagementDialog></I18nProvider>); });
+    assert.equal(document.querySelectorAll('[role="dialog"]').length, 1);
+    assert.equal(mounts, 1, 'rerender does not spawn another manager');
+    const closeButton = document.querySelector<HTMLButtonElement>('[role="dialog"] button[data-dialog-close]:not([aria-hidden])')!;
+    await act(async () => {
+      closeButton.focus();
+      closeButton.dispatchEvent(new KeyboardEvent('keydown', { key: 'Tab', bubbles: true, cancelable: true }));
+    });
+    assert.equal(document.activeElement?.getAttribute('aria-label'), 'Plugin search', 'Tab wraps inside the modal');
+    await act(async () => { document.activeElement!.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape', bubbles: true })); await settle(); });
+    assert.equal(document.querySelector('[role="dialog"]'), null);
+    assert.equal(document.activeElement, trigger);
+    assert.equal(unmounts, 1);
+    await click(trigger);
+    assert.equal(mounts, 2);
+    await click(document.querySelector<HTMLButtonElement>('[role="dialog"] button[data-dialog-close]:not([aria-hidden])')!);
+    assert.equal(document.querySelector('[role="dialog"]'), null);
+    assert.equal(document.activeElement, trigger);
+    assert.equal(unmounts, 2);
+    let handedOff = false;
+    await act(async () => root.render(<I18nProvider locale="en"><PluginManagementDialog>{(handoff) => <button onClick={() => handoff(() => {
+      handedOff = true;
+      assert.equal(document.querySelector('[role="dialog"]'), null);
+      assert.notEqual(document.body.style.pointerEvents, 'none');
+    })}>Open contributed settings view</button>}</PluginManagementDialog></I18nProvider>));
+    await click(trigger);
+    await click(document.querySelector<HTMLButtonElement>('[role="dialog"] button:not([data-dialog-close])')!);
+    assert.equal(handedOff, true, 'external view opens only after modal ownership is released');
+  } finally {
+    await act(async () => root.unmount());
+    dom.window.close();
+    for (const [key, descriptor] of previous) {
+      if (descriptor) Object.defineProperty(globalThis, key, descriptor);
+      else Reflect.deleteProperty(globalThis, key);
+    }
+  }
+});

components/settings/tabs/PluginManagementDialog.tsx

@@ -0,0 +1,38 @@
+import React, { useRef, useState } from 'react';
+import { useI18n } from '../../../application/i18n/I18nProvider';
+import { Button } from '../../ui/button';
+import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogTrigger } from '../../ui/dialog';
+
+/** Uses the existing renderer and host bridge; opening the manager never starts a plugin. */
+export function PluginManagementDialog({ children }: {
+  children: React.ReactNode | ((handoff: (action: () => void) => void) => React.ReactNode);
+}) {
+  const { t } = useI18n();
+  const [open, setOpen] = useState(false);
+  const pendingHandoff = useRef<(() => void) | null>(null);
+  const handoff = (action: () => void) => { pendingHandoff.current = action; setOpen(false); };
+  return (
+    <Dialog open={open} onOpenChange={setOpen}>
+      <DialogTrigger asChild>
+        <Button variant="outline">{t('settings.plugins.openManager')}</Button>
+      </DialogTrigger>
+      <DialogContent onCloseAutoFocus={(event) => {
+        const action = pendingHandoff.current;
+        pendingHandoff.current = null;
+        if (action) {
+          event.preventDefault();
+          // Wait for Radix to release modal pointer/focus ownership before opening
+          // the existing external plugin view host (including exit animations).
+          queueMicrotask(action);
+        }
+      }} className="flex h-[min(88dvh,900px)] w-[calc(100vw-2rem)] max-w-[1180px] flex-col gap-0 overflow-hidden p-0">
+        <DialogHeader className="shrink-0 border-b px-6 py-4 pr-12 text-left">
+          <DialogTitle>{t('settings.plugins.title')}</DialogTitle>
+        </DialogHeader>
+        <div data-settings-scroll-pane className="min-h-0 flex-1 overflow-y-auto overscroll-contain p-4 sm:p-6">
+          {typeof children === 'function' ? children(handoff) : children}
+        </div>
+      </DialogContent>
+    </Dialog>
+  );
+}

components/settings/tabs/PluginMarketplace.interaction.test.tsx

@@ -0,0 +1,164 @@
+import assert from 'node:assert/strict';
+import test, { before, after } from 'node:test';
+import { JSDOM } from 'jsdom';
+import React, { useState } from 'react';
+import { act, create, type ReactTestRenderer } from 'react-test-renderer';
+import { renderToStaticMarkup } from 'react-dom/server';
+import { readFileSync } from 'node:fs';
+import { I18nProvider } from '../../../application/i18n/I18nProvider';
+import { PluginMarketplaceContent } from './PluginMarketplace';
+import type { usePluginCatalog } from '../../../application/state/usePluginCatalog';
+
+const infoDom = new JSDOM('<!doctype html><html><body></body></html>');
+const previousWindow = Object.getOwnPropertyDescriptor(globalThis, 'window');
+const previousDocument = Object.getOwnPropertyDescriptor(globalThis, 'document');
+before(() => {
+  Object.defineProperty(globalThis, 'window', { configurable: true, value: infoDom.window });
+  Object.defineProperty(globalThis, 'document', { configurable: true, value: infoDom.window.document });
+});
+after(() => {
+  infoDom.window.close();
+  if (previousWindow) Object.defineProperty(globalThis, 'window', previousWindow); else Reflect.deleteProperty(globalThis, 'window');
+  if (previousDocument) Object.defineProperty(globalThis, 'document', previousDocument); else Reflect.deleteProperty(globalThis, 'document');
+});
+
+const entries = ['Alpha', 'Beta'].map((name) => ({
+  id: `com.example.${name.toLowerCase()}`, name, author: 'Example', version: '1.0.0', license: 'MIT',
+  description: `${name} local utility`, repository: 'example/plugins', commit: 'a'.repeat(40),
+  manifest: { manifestVersion: 1, id: `com.example.${name.toLowerCase()}`, name, version: '1.0.0', publisher: 'Example', engines: { netcatty: '>=1.0.0', api: '0.1.0-internal' }, main: { browser: 'index.js' }, permissions: { required: ['settings.read'] } },
+})) as NetcattyPluginCatalogEntry[];
+const catalog = {
+  entries, source: 'registry', listStatus: 'ready', listError: null, readme: '# Author documentation', readmeStatus: 'ready', readmeError: null,
+  error: null, busy: false, retryList() {}, retryReadme() {}, async install() {},
+} as ReturnType<typeof usePluginCatalog>;
+
+test('catalog keeps search during selection/back, switches detail, and displays real installed state', async () => {
+  const previousRaf = globalThis.requestAnimationFrame;
+  globalThis.requestAnimationFrame = (callback) => { callback(0); return 0; };
+  const actGlobal = globalThis as typeof globalThis & { IS_REACT_ACT_ENVIRONMENT?: boolean };
+  const previousActEnvironment = actGlobal.IS_REACT_ACT_ENVIRONMENT;
+  actGlobal.IS_REACT_ACT_ENVIRONMENT = true;
+  let renderer: ReactTestRenderer;
+  function Harness() {
+    const [selected, setSelected] = useState<string | null>(null);
+    return <I18nProvider locale="en"><PluginMarketplaceContent catalog={catalog} selected={selected} onSelect={setSelected}
+      installed={[{ id: entries[0].id, activeVersion: '0.9.0', enabled: false, runtime: { lastError: 'Incompatible with this host' } } as NetcattyInstalledPlugin]} /></I18nProvider>;
+  }
+  try {
+    await act(async () => { renderer = create(<Harness />); });
+    const cards = () => renderer.root.findAll((node) => node.type === 'button' && Boolean(node.props['data-plugin-id']));
+    const input = () => renderer.root.findByType('input');
+    assert.equal(cards().length, 2);
+    await act(async () => input().props.onChange({ target: { value: 'Alpha' } }));
+    assert.equal(cards().length, 1);
+    await act(async () => cards()[0].props.onClick());
+    assert.equal(renderer.root.findByType('article').props['aria-label'], 'Alpha');
+    assert.equal(cards().length, 0, 'detail replaces the entire grid at every width');
+    assert.equal(renderer.root.findAllByType('input').length, 0);
+    const detailText = JSON.stringify(renderer.toJSON());
+    assert.match(detailText, /0.9.0/);
+    assert.match(detailText, /Disabled/);
+    assert.match(detailText, /Incompatible with this host/);
+    assert.match(detailText, /Last recorded error/);
+    assert.equal(renderer.root.findAllByType('details').length, 0, 'permissions are not hidden in a disclosure');
+    assert.equal(renderer.root.findAll((node) => node.type === 'button' && node.children.includes('Install this version (disabled)')).length, 0, 'source-only cards have no install action');
+    const back = () => renderer.root.findAllByType('button').find((node) => node.children.includes('All plugins'))!;
+    await act(async () => back().props.onClick());
+    assert.equal(renderer.root.findAllByType('article').length, 0);
+    assert.equal(input().props.value, 'Alpha');
+    await act(async () => input().props.onChange({ target: { value: '' } }));
+    await act(async () => cards()[1].props.onClick());
+    assert.equal(renderer.root.findByType('article').props['aria-label'], 'Beta');
+    assert.equal(cards().length, 0);
+    await act(async () => back().props.onClick());
+    await act(async () => input().props.onChange({ target: { value: 'no match' } }));
+    assert.equal(cards().length, 0);
+    assert.equal(input().props.value, 'no match');
+    await act(async () => renderer.unmount());
+  } finally {
+    globalThis.requestAnimationFrame = previousRaf;
+    actGlobal.IS_REACT_ACT_ENVIRONMENT = previousActEnvironment;
+  }
+});
+
+
+test('README failure leaves the permissions and source visible, before the failure message', () => {
+  const html = renderToStaticMarkup(<I18nProvider locale="en"><PluginMarketplaceContent
+    catalog={{ ...catalog, readmeStatus: 'error', readme: null, readmeError: 'Network unavailable' }}
+    selected={entries[0].id} onSelect={() => {}} installed={[]} /></I18nProvider>);
+  assert.match(html, /Compatibility and permissions/);
+  assert.match(html, /settings.read/);
+  assert.match(html, /not a grant/);
+  assert.match(html, /Source example/);
+  assert.ok(html.indexOf('settings.read') < html.indexOf('Network unavailable'));
+  assert.match(html, /Retry/);
+  assert.doesNotMatch(html, /<details/);
+});
+
+test('cards use subtle shadows and details have no breakpoint-specific columns or nested scroller', () => {
+  const css = readFileSync(new URL('./plugin-marketplace.css', import.meta.url), 'utf8');
+  assert.match(css, /box-shadow: 0 1px 4px/);
+  assert.match(css, /\.dark \.plugin-card/);
+  assert.doesNotMatch(css, /@container|248px|max-height|overflow-y/);
+});
+
+test('full-page detail starts at the top and back restores the settings scroll and card focus', async () => {
+  const previousRaf = globalThis.requestAnimationFrame;
+  const frames: FrameRequestCallback[] = [];
+  globalThis.requestAnimationFrame = (callback) => { frames.push(callback); return frames.length; };
+  const actGlobal = globalThis as typeof globalThis & { IS_REACT_ACT_ENVIRONMENT?: boolean };
+  const previousActEnvironment = actGlobal.IS_REACT_ACT_ENVIRONMENT;
+  actGlobal.IS_REACT_ACT_ENVIRONMENT = true;
+  const pane = { scrollTop: 450 };
+  let focused = false;
+  const list = { scrollTop: 0, closest: (selector: string) => selector === '.plugin-marketplace' ? { clientWidth: 1100 } : pane,
+    querySelectorAll: () => [{ dataset: { pluginId: entries[0].id }, focus: () => { focused = true; } }] };
+  let renderer!: ReactTestRenderer;
+  function Harness() {
+    const [selected, setSelected] = useState<string | null>(null);
+    return <I18nProvider locale="en"><PluginMarketplaceContent catalog={catalog} selected={selected} onSelect={setSelected} installed={[]} /></I18nProvider>;
+  }
+  try {
+    await act(async () => { renderer = create(<Harness />, { createNodeMock: (element) => element.type === 'div' && (element.props as { className?: string }).className?.includes('plugin-marketplace-catalog') ? list : null }); });
+    const card = renderer.root.findAll((node) => node.type === 'button' && node.props['data-plugin-id'] === entries[0].id)[0];
+    await act(async () => card.props.onClick());
+    frames.splice(0).forEach((frame) => frame(0));
+    assert.equal(pane.scrollTop, 0);
+    const back = renderer.root.findAllByType('button').find((node) => node.children.includes('All plugins'))!;
+    await act(async () => back.props.onClick());
+    frames.splice(0).forEach((frame) => frame(0));
+    assert.equal(pane.scrollTop, 450);
+    assert.equal(focused, true);
+    await act(async () => renderer.unmount());
+  } finally {
+    globalThis.requestAnimationFrame = previousRaf;
+    actGlobal.IS_REACT_ACT_ENVIRONMENT = previousActEnvironment;
+  }
+});
+
+test('offline catalog warning keeps details visible and disables market installation', () => {
+  const downloadable = { ...entries[0], artifact: { url: 'https://github.com/example/plugin/releases/download/v1/plugin.ncpkg', sha256: 'a'.repeat(64) } };
+  const html = renderToStaticMarkup(<I18nProvider locale="en"><PluginMarketplaceContent
+    catalog={{ ...catalog, entries: [downloadable], listError: 'Registry offline', source: 'cached' }}
+    selected={downloadable.id} onSelect={() => {}} installed={[]} /></I18nProvider>);
+  assert.match(html, /Offline catalog · installation unavailable/);
+  assert.match(html, /Compatibility and permissions/);
+  assert.match(html, /<button[^>]*disabled=""[^>]*>Install this version/);
+  assert.match(html, /Notices: 1/);
+});
+
+test('manual refresh remains available after success and is disabled while loading', () => {
+  const ready = renderToStaticMarkup(<I18nProvider locale="en"><PluginMarketplaceContent catalog={catalog} selected={null} onSelect={() => {}} installed={[]} /></I18nProvider>);
+  assert.match(ready, />Refresh<\/button>/);
+  const loading = renderToStaticMarkup(<I18nProvider locale="en"><PluginMarketplaceContent catalog={{ ...catalog, listStatus: 'loading' }} selected={null} onSelect={() => {}} installed={[]} /></I18nProvider>);
+  assert.match(loading, /<button[^>]*disabled=""[^>]*>Refresh<\/button>/);
+});
+
+test('replacing an installed plugin discloses that its running version will stop beside the install action', () => {
+  const downloadable = { ...entries[0], artifact: { url: 'https://github.com/example/plugin/releases/download/v1/plugin.ncpkg', sha256: 'a'.repeat(64) } };
+  const html = renderToStaticMarkup(<I18nProvider locale="en"><PluginMarketplaceContent
+    catalog={{ ...catalog, entries: [downloadable] }} selected={downloadable.id} onSelect={() => {}}
+    installed={[{ id: downloadable.id, activeVersion: '0.9.0', enabled: true } as NetcattyInstalledPlugin]} /></I18nProvider>);
+  assert.match(html, /<p[^>]*>This replaces and stops the installed version\./);
+  assert.ok(html.indexOf('This replaces and stops') < html.indexOf('Install this version (disabled)'));
+});

components/settings/tabs/PluginMarketplace.test.ts

@@ -0,0 +1,9 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { filterPluginCatalog } from './PluginMarketplace';
+test('catalog search matches name, author and description without case sensitivity', () => {
+  const entries = [{ id: 'a', name: 'Starter', author: 'Netcatty', description: 'Local greeting' }] as NetcattyPluginCatalogEntry[];
+  for (const query of ['starter', 'NETCATTY', ' greeting ']) assert.equal(filterPluginCatalog(entries, query).length, 1);
+  assert.equal(filterPluginCatalog(entries, 'unrelated').length, 0);
+  assert.equal(filterPluginCatalog(entries, '').length, 1);
+});

components/settings/tabs/PluginMarketplace.tsx

@@ -0,0 +1,106 @@
+import { createPortal } from 'react-dom';
+import { PluginStatus } from './PluginStatus';
+import { PluginInfo } from './PluginInfo';
+import React, { useRef, useState } from 'react';
+import { PluginBrandIcon } from '../../plugins/PluginBrandIcon';
+import { ArrowLeft } from 'lucide-react';
+import { useI18n } from '../../../application/i18n/I18nProvider';
+import { usePluginCatalog } from '../../../application/state/usePluginCatalog';
+import { Input } from '../../ui/input';
+import { Button } from '../../ui/button';
+import { PluginPackageDetails } from './PluginPackageManager';
+import { PluginReadme } from './PluginReadme';
+
+export function PluginMarketplace({ installed = [], toolbarContainer, noVault }: { noVault?: boolean; installed?: NetcattyInstalledPlugin[]; toolbarContainer?: HTMLElement | null }) {
+  const [selected, setSelected] = useState<string | null>(null);
+  const catalog = usePluginCatalog(selected);
+  return <PluginMarketplaceContent catalog={catalog} installed={installed} selected={selected} onSelect={setSelected} toolbarContainer={toolbarContainer} noVault={noVault} />;
+}
+
+// The browser owns only presentation state; installation and README policy stay in the existing hook.
+export function PluginMarketplaceContent({ catalog, installed, selected, onSelect, toolbarContainer, noVault }: {
+  noVault?: boolean;
+  toolbarContainer?: HTMLElement | null;
+  catalog: ReturnType<typeof usePluginCatalog>;
+  installed: NetcattyInstalledPlugin[];
+  selected: string | null;
+  onSelect: (id: string | null) => void;
+}) {
+  const { t } = useI18n();
+  const [search, setSearch] = useState('');
+  const listRef = useRef<HTMLDivElement>(null);
+  const detailRef = useRef<HTMLHeadingElement>(null);
+  const lastSelection = useRef<string | null>(null);
+  const pageScroll = useRef(0);
+  const entry = catalog.entries.find((item) => item.id === selected);
+  const filtered = filterPluginCatalog(catalog.entries, search);
+  const installedEntry = installed.find((item) => item.id === entry?.id);
+  const choose = (id: string) => {
+    const pane = listRef.current?.closest<HTMLElement>('[data-settings-scroll-pane]');
+    pageScroll.current = pane?.scrollTop ?? 0;
+    lastSelection.current = id;
+    onSelect(id);
+    requestAnimationFrame(() => {
+      if (pane) pane.scrollTop = 0;
+      detailRef.current?.focus({ preventScroll: true });
+    });
+  };
+  const back = () => {
+    onSelect(null);
+    requestAnimationFrame(() => {
+      if (listRef.current) {
+        const pane = listRef.current.closest('[data-settings-scroll-pane]');
+        if (pane) pane.scrollTop = pageScroll.current;
+        const button = Array.from(listRef.current.querySelectorAll<HTMLButtonElement>('[data-plugin-id]'))
+          .find((item) => item.dataset.pluginId === lastSelection.current);
+        button?.focus({ preventScroll: true });
+      }
+    });
+  };
+  const refresh = !entry && <Button variant="outline" size="sm" disabled={catalog.listStatus === 'loading'} onClick={catalog.retryList}>{t('common.refresh')}</Button>;
+  return <section className="plugin-marketplace space-y-4" aria-label={t('settings.plugins.market.title')}>
+    {toolbarContainer ? createPortal(<><PluginStatus noVault={noVault} offlineError={catalog.listError} retry={catalog.retryList} />{refresh}</>, toolbarContainer) : <div className="flex items-center gap-2"><PluginStatus noVault={noVault} offlineError={catalog.listError} retry={catalog.retryList} />{refresh}</div>}
+    {catalog.error && <p role="alert" className="text-xs text-destructive">{catalog.error}</p>}
+    <div className="plugin-marketplace-browser">
+      {!entry && <div className="plugin-marketplace-catalog space-y-3" ref={listRef}>
+        <div className="flex items-center gap-3"><Input value={search} onChange={(event) => setSearch(event.target.value)} placeholder={t('settings.plugins.market.search')} aria-label={t('settings.plugins.market.search')} />
+        {catalog.listStatus === 'ready' && <p className="shrink-0 text-xs text-muted-foreground" aria-live="polite">{t('settings.plugins.market.results', { count: filtered.length })}</p>}</div>
+        {catalog.listStatus === 'ready' && catalog.entries.length > 0 && filtered.length === 0 && <p className="rounded-lg border border-dashed p-6 text-center text-sm text-muted-foreground">{t('settings.plugins.market.noResults')}</p>}
+        {catalog.listStatus === 'loading' && <p className="text-xs text-muted-foreground">{t('settings.plugins.loading')}</p>}
+        {catalog.listStatus === 'error' && <div role="alert" className="space-y-2 text-xs text-destructive"><p>{catalog.listError}</p><Button variant="outline" size="sm" onClick={catalog.retryList}>{t('settings.plugins.market.retry')}</Button></div>}
+        {catalog.listStatus === 'ready' && catalog.entries.length === 0 && <p className="text-xs text-muted-foreground">{t('settings.plugins.market.empty')}</p>}
+        <div className="plugin-marketplace-grid">{filtered.map((item) => {
+          const isInstalled = installed.some((plugin) => plugin.id === item.id);
+          return <button key={item.id} type="button" data-plugin-id={item.id} aria-current={selected === item.id ? 'true' : undefined} onClick={() => choose(item.id)}
+            className="plugin-card min-w-0 flex min-h-[200px] flex-col gap-3 rounded-lg bg-card p-4 text-left focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring">
+            <div className="flex items-center gap-3"><span className="flex h-8 w-8 shrink-0 items-center justify-center"><PluginBrandIcon entry={item} size={32} className="text-muted-foreground" /></span><span className="min-w-0 break-words text-sm font-semibold leading-5">{item.name}</span></div>
+            <p className="break-words text-xs text-muted-foreground">{item.author}</p>
+            <p className="line-clamp-3 break-words text-sm leading-5 text-muted-foreground">{item.description}</p>
+            <div className="mt-auto flex flex-wrap items-center justify-between gap-2 pt-1 text-xs text-muted-foreground"><span>{item.version} · {item.license}</span><span className="text-foreground">{t('settings.plugins.manager.details')}</span></div>
+            <div className="flex flex-wrap gap-2 text-xs text-muted-foreground">{isInstalled && <span className="rounded bg-muted px-2 py-0.5 text-foreground">{t('settings.plugins.market.installed')}</span>}{!item.artifact && <span className="rounded bg-muted/40 px-2 py-0.5">{t('settings.plugins.market.sourceBadge')}</span>}</div>
+          </button>;
+        })}</div>
+      </div>}
+      {entry && <article key={entry.id} aria-label={entry.name} className="plugin-marketplace-detail mx-auto w-full max-w-[920px] min-w-0 space-y-6 focus:outline-none">
+        <Button variant="ghost" size="sm" onClick={back}><ArrowLeft size={14} className="mr-2" />{t('settings.plugins.market.back')}</Button>
+        <div className="space-y-2"><div className="flex items-center gap-3"><PluginBrandIcon entry={entry} size={48} /><h4 ref={detailRef} tabIndex={-1} className="break-words text-xl font-semibold focus:outline-none">{entry.name}</h4></div><p className="text-xs text-muted-foreground">{entry.author} · {entry.version} · {entry.license}</p>
+          {installedEntry && <p className="text-xs text-muted-foreground">{t('settings.plugins.market.installed')} · {installedEntry.activeVersion} · {t(installedEntry.enabled ? 'settings.plugins.manager.enabled' : 'settings.plugins.manager.disabled')}</p>}
+        </div>
+        {installedEntry?.runtime?.lastError && <p role="status" className="break-words text-xs text-destructive">{t('settings.plugins.manager.lastError')}: {installedEntry.runtime.lastError}</p>}
+        <p className="text-sm leading-6 text-muted-foreground">{entry.description}</p>
+        <a className="block break-all text-xs text-primary underline underline-offset-4" href={`https://github.com/${entry.repository}/tree/${entry.commit}`} target="_blank" rel="noopener noreferrer">{entry.repository} @ {entry.commit.slice(0, 12)}</a>
+        {entry.artifact ? <div className="space-y-2"><p className="text-xs text-muted-foreground">{t('settings.plugins.market.installNote')}</p>{catalog.listError && <p role="status" className="text-xs text-muted-foreground">{t('settings.plugins.market.offlineShort')}</p>}<Button size="sm" disabled={catalog.busy || Boolean(catalog.listError)} onClick={() => void catalog.install(entry.id)}>{t('settings.plugins.market.install')}</Button></div> : <div className="flex items-center gap-1 text-xs text-muted-foreground"><span>{t('settings.plugins.market.sourceBadge')}</span><PluginInfo label={t('settings.plugins.market.sourceBadge')}>{t('settings.plugins.market.sourceOnly')}</PluginInfo></div>}
+        <section><h4 className="mb-3 text-sm font-semibold">{t('settings.plugins.market.manifest')}</h4><PluginPackageDetails plugin={{ id: entry.id, activeVersion: entry.version, enabled: false, manifest: entry.manifest, archiveSha256: entry.artifact?.sha256, runtime: { status: 'stopped', kind: null, lastError: null, quarantinedAt: null } }} /></section>
+        <div className="min-w-0 border-t pt-4"><div className="flex items-center gap-1"><h4 className="text-sm font-semibold">README</h4><PluginInfo label={t('settings.plugins.market.readmeInfo')}>{t('settings.plugins.market.readmeNote')}</PluginInfo></div>{catalog.readmeStatus === 'loading' && <p className="mt-3 text-xs text-muted-foreground">{t('settings.plugins.loading')}</p>}
+          {catalog.readmeStatus === 'error' && <div role="alert" className="mt-3 space-y-2 text-xs text-destructive"><p>{catalog.readmeError}</p><Button variant="outline" size="sm" onClick={catalog.retryReadme}>{t('settings.plugins.market.retry')}</Button></div>}
+          {catalog.readmeStatus === 'ready' && (catalog.readme?.trim() ? <PluginReadme markdown={catalog.readme} /> : <p className="mt-3 text-xs text-muted-foreground">{t('settings.plugins.market.emptyReadme')}</p>)}
+        </div>
+      </article>}
+    </div>
+  </section>;
+}
+
+export function filterPluginCatalog(entries: NetcattyPluginCatalogEntry[], query: string) {
+  const needle = query.trim().toLocaleLowerCase();
+  return entries.filter((entry) => `${entry.name} ${entry.author} ${entry.description}`.toLocaleLowerCase().includes(needle));
+}

components/settings/tabs/PluginPackageManager.test.tsx

@@ -0,0 +1,27 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import React from 'react';
+import { renderToStaticMarkup } from 'react-dom/server';
+import { I18nProvider } from '../../../application/i18n/I18nProvider';
+import { PluginPackageDetails } from './PluginPackageManager';
+
+test('package detail renders manifest resources as text and explains advanced authority', () => {
+  const plugin = {
+    id: 'com.example.synthetic', enabled: false, activeVersion: '1.0.0',
+    archiveSha256: 'a'.repeat(64),
+    manifest: {
+      manifestVersion: 1, id: 'com.example.synthetic', name: 'synthetic', version: '1.0.0', publisher: 'example',
+      engines: { netcatty: '>=1.0.0 <2.0.0', api: '0.1.0-internal' },
+      main: { node: 'index.js' },
+      permissions: { required: [{ permission: 'network', resources: ['https://example.com'], reason: '<script>attack()</script>' }] },
+    },
+    runtime: { status: 'stopped', kind: null, lastError: null, quarantinedAt: null },
+  } as NetcattyInstalledPlugin;
+  const html = renderToStaticMarkup(<I18nProvider locale="en"><PluginPackageDetails plugin={plugin} /></I18nProvider>);
+  assert.match(html, /full Node filesystem and network authority/);
+  assert.match(html, /https:\/\/example.com/);
+  assert.match(html, /&lt;script&gt;/);
+  assert.doesNotMatch(html, /<script>/);
+  assert.match(html, /not a grant/);
+  assert.match(html, /aaaaaaaaaaaaaaaa/);
+});

components/settings/tabs/PluginPackageManager.tsx

@@ -0,0 +1,121 @@
+import { describePluginPermission } from '@/domain/pluginPermissionDescriptions.cjs';
+import { describePluginRuntime } from '@/domain/pluginRuntimePolicy.cjs';
+import React, { useRef, useState } from 'react';
+import { PluginPermissionPanel } from './PluginPermissionPanel';
+import { PluginBrandIcon } from '../../plugins/PluginBrandIcon';
+import { ArrowLeft } from 'lucide-react';
+import { usePluginManager } from '../../../application/state/usePluginManager';
+import { useI18n } from '../../../application/i18n/I18nProvider';
+import { Button } from '../../ui/button';
+import { Input } from '../../ui/input';
+
+export function PluginPackageDetails({ plugin }: { plugin: NetcattyInstalledPlugin }) {
+  const { t, resolvedLocale } = useI18n();
+  const manifest = plugin.manifest;
+  if (!manifest) return null;
+  const permissions = [
+    ...(manifest.permissions?.required ?? []).map((value) => ({ value, required: true })),
+    ...(manifest.permissions?.optional ?? []).map((value) => ({ value, required: false })),
+  ];
+  const policy = describePluginRuntime(manifest);
+  const runtimeKind = plugin.runtime.kind ?? policy.defaultRuntimeKind;
+  const runtimeLabel = runtimeKind === 'utility' ? 'advanced'
+    : policy.hasNode ? 'dual' : policy.declaresAdvanced ? 'advancedDeclaration' : 'browser';
+  return <div className="space-y-4 border-t border-border/60 pt-4 text-sm">
+    <dl className="grid grid-cols-[auto_1fr] gap-x-4 gap-y-2 text-xs">
+      <dt className="text-muted-foreground">ID</dt><dd className="break-all font-mono">{plugin.id}</dd>
+      <dt className="text-muted-foreground">Netcatty</dt><dd>{manifest.engines.netcatty}</dd>
+      <dt className="text-muted-foreground">API</dt><dd>{manifest.engines.api}</dd>
+      <dt className="text-muted-foreground">SHA-256</dt><dd className="break-all font-mono">{plugin.archiveSha256 ?? '-'}</dd>
+    </dl>
+    <p className={!policy.browserOnly && !policy.dataOnly ? 'text-destructive' : 'text-muted-foreground'}>{policy.dataOnly ? t('settings.plugins.manager.dataTheme') : t(`settings.plugins.manager.${runtimeLabel}`)}</p>
+    <div className="space-y-2">
+      <h4 className="font-medium">{t('settings.plugins.manager.permissions')}</h4>
+      <p className="text-xs text-muted-foreground">{t('settings.plugins.manager.permissionNote')}</p>
+      {permissions.length === 0 && <p className="text-xs text-muted-foreground">{t('settings.plugins.manager.noPermissions')}</p>}
+      {permissions.map(({ value, required }, index) => {
+        const id = typeof value === 'string' ? value : value.permission;
+        const description = describePluginPermission(id, resolvedLocale);
+        return <div key={index} className="rounded-md bg-muted/40 p-3">
+        <div className="flex justify-between gap-3"><span className="text-sm font-medium">{description.label}</span><span className="text-xs text-muted-foreground">{t(required ? 'settings.plugins.manager.required' : 'settings.plugins.manager.optional')}</span></div>
+        <p className="mt-1 text-xs text-muted-foreground">{description.description}</p>
+        <code className="mt-1 block break-all text-[10px] text-muted-foreground">{id}</code>
+        {description.sensitive && <p className="mt-1 text-xs font-medium text-destructive">{t('settings.plugins.manager.sensitive')}</p>}
+        {(typeof value === 'string' || value.resources.length === 0) && <p className="mt-1 text-xs">{t('settings.plugins.manager.unbounded')}</p>}
+        {typeof value !== 'string' && <><p className="mt-1 whitespace-pre-wrap break-all text-xs">{value.resources.join('\n')}</p>{value.reason && <p className="mt-1 text-xs text-muted-foreground">{value.reason}</p>}</>}
+      </div>; })}
+    </div>
+    <p className="text-xs text-muted-foreground">{t('settings.plugins.manager.data')}</p>
+  </div>;
+}
+
+export function PluginPackageManager({ manager, onSelectionChange }: { manager: ReturnType<typeof usePluginManager>; onSelectionChange?: (id: string | null) => void }) {
+  const { t, resolvedLocale } = useI18n();
+  const [selected, setSelected] = useState<string | null>(null);
+  const [search, setSearch] = useState('');
+  const rootRef = useRef<HTMLElement>(null);
+  const scrollTop = useRef(0);
+  const lastSelection = useRef<string | null>(null);
+  const selectedPlugin = manager.plugins.find((plugin) => plugin.id === selected);
+  const nameOf = (plugin: NetcattyInstalledPlugin) => typeof plugin.manifest?.displayName === 'string' ? plugin.manifest.displayName : plugin.manifest?.displayName?.[resolvedLocale] ?? plugin.manifest?.displayName?.en ?? plugin.manifest?.name ?? plugin.id;
+  const descriptionOf = (plugin: NetcattyInstalledPlugin) => {
+    const value = plugin.manifest?.description;
+    return typeof value === 'string' ? value : value?.[resolvedLocale] ?? value?.en ?? '';
+  };
+  const choose = (id: string | null) => {
+    const pane = rootRef.current?.closest<HTMLElement>('[data-settings-scroll-pane]');
+    if (id) { scrollTop.current = pane?.scrollTop ?? 0; lastSelection.current = id; }
+    setSelected(id); setRemoving(null); onSelectionChange?.(id);
+    requestAnimationFrame(() => {
+      if (pane) pane.scrollTop = id ? 0 : scrollTop.current;
+      if (id) rootRef.current?.querySelector<HTMLElement>('[data-plugin-detail]')?.focus({ preventScroll: true });
+      else Array.from(rootRef.current?.querySelectorAll<HTMLButtonElement>('[data-plugin-card]') ?? []).find((button) => button.dataset.pluginCard === lastSelection.current)?.focus({ preventScroll: true });
+    });
+  };
+  const visible = selectedPlugin ? [selectedPlugin] : manager.plugins.filter((plugin) => [nameOf(plugin), plugin.manifest?.publisher, plugin.manifest?.description, plugin.id].some((value) => JSON.stringify(value ?? '').toLocaleLowerCase().includes(search.trim().toLocaleLowerCase())));
+  const [removing, setRemoving] = useState<string | null>(null);
+  if (!manager.available) return null;
+  return <section ref={rootRef} className="space-y-4" aria-label={t('settings.plugins.manager.installed')}>
+    {selectedPlugin && <Button variant="ghost" size="sm" onClick={() => choose(null)}><ArrowLeft size={14} className="mr-2" />{t('settings.plugins.manager.installed')}</Button>}
+    {!selectedPlugin && manager.plugins.length > 0 && <Input value={search} onChange={(event) => setSearch(event.target.value)} placeholder={t('settings.plugins.market.search')} aria-label={t('settings.plugins.market.search')} />}
+    {!selectedPlugin && manager.plugins.length > 0 && visible.length === 0 && <p className="p-6 text-center text-sm text-muted-foreground">{t('settings.plugins.market.noResults')}</p>}
+    {manager.error && <p role="alert" className="text-sm text-destructive">{manager.error}</p>}
+    {!manager.plugins.length && <div className="rounded-xl border border-dashed border-border p-8 text-center text-sm text-muted-foreground">{t('settings.plugins.manager.empty')}</div>}
+    <div className={selectedPlugin ? 'space-y-4' : 'grid grid-cols-[repeat(auto-fill,minmax(min(100%,280px),1fr))] gap-3'}>
+    {visible.map((plugin) => <article key={plugin.id} data-plugin-detail={selectedPlugin ? true : undefined} tabIndex={selectedPlugin ? -1 : undefined} aria-label={nameOf(plugin)} className={`min-w-0 rounded-lg focus:outline-none ${selectedPlugin ? 'space-y-4' : 'plugin-card flex min-h-[200px] flex-col gap-3 bg-card p-4'}`}>
+      <div className="flex flex-wrap items-center gap-3">
+        <div className="flex h-12 w-12 shrink-0 items-center justify-center"><PluginBrandIcon plugin={plugin} size={32} /></div>
+        <button type="button" data-plugin-card={plugin.id} className="min-w-0 flex-1 rounded text-left focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring" aria-expanded={selected === plugin.id} onClick={() => choose(selected === plugin.id ? null : plugin.id)}>
+          <div className="break-words text-sm font-medium">{nameOf(plugin)}</div>
+
+        </button>
+        <Button variant="ghost" size="sm" type="button"
+          className={`h-7 shrink-0 rounded-full border-0 px-3 text-xs focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background ${manager.statusKnown !== false && plugin.enabled ? 'bg-primary/10 hover:bg-primary/15' : 'bg-muted/60 text-muted-foreground hover:bg-muted hover:text-foreground'}`}
+          style={manager.statusKnown !== false && plugin.enabled ? { color: 'color-mix(in srgb, hsl(var(--primary)) 40%, hsl(var(--foreground)))' } : undefined}
+          aria-pressed={manager.statusKnown === false ? undefined : plugin.enabled} aria-busy={manager.busy}
+          aria-label={`${t(manager.statusKnown === false ? 'settings.plugins.permissions.statusUnknown' : plugin.enabled ? 'settings.plugins.manager.disable' : 'settings.plugins.manager.enable')} ${plugin.manifest?.name ?? plugin.id}`}
+          title={t(manager.statusKnown === false ? 'settings.plugins.permissions.statusUnknown' : plugin.enabled ? 'settings.plugins.manager.disable' : 'settings.plugins.manager.enable')}
+          disabled={manager.busy || manager.statusKnown === false} onClick={() => void manager.setEnabled(plugin.id, !plugin.enabled)}>
+          {t(manager.statusKnown === false ? 'settings.plugins.permissions.statusUnknown' : plugin.enabled ? 'settings.plugins.manager.enabled' : 'settings.plugins.manager.disabled')}
+        </Button>
+      </div>
+      {plugin.manifest?.publisher && <p className="break-words text-xs text-muted-foreground">{plugin.manifest.publisher}</p>}
+      <p className={`break-words text-sm leading-5 text-muted-foreground ${selectedPlugin ? 'whitespace-pre-wrap' : 'line-clamp-3'}`}>{descriptionOf(plugin) || t('settings.plugins.manager.noDescription')}</p>
+      {!selectedPlugin ? <div className="mt-auto flex flex-wrap items-center justify-between gap-2 pt-1">
+        <p className="break-words text-xs text-muted-foreground">{plugin.activeVersion}{plugin.manifest?.license ? ` · ${plugin.manifest.license}` : ''}</p>
+        <Button variant="ghost" size="sm" className="h-7 px-2 text-xs" onClick={() => choose(plugin.id)} aria-label={`${t('settings.plugins.manager.details')} ${nameOf(plugin)}`}>{t('settings.plugins.manager.details')}</Button>
+      </div> : <p className="text-xs text-muted-foreground">{plugin.activeVersion}{plugin.manifest?.license ? ` · ${plugin.manifest.license}` : ''}</p>}
+      {plugin.runtime.lastError && <p role="status" className="break-words text-xs text-destructive">{t('settings.plugins.manager.lastError')}: {plugin.runtime.lastError}</p>}
+      {selected === plugin.id && <>
+        <PluginPackageDetails plugin={plugin} />
+        <PluginPermissionPanel key={plugin.id} pluginId={plugin.id} onChanged={async () => { await manager.refresh(); }} />
+        {removing === plugin.id ? <div className="space-y-2 rounded-lg border border-destructive/30 p-3">
+          <p className="text-xs">{t('settings.plugins.manager.removeNote')}</p>
+          <Button variant="destructive" size="sm" disabled={manager.busy} onClick={() => { void manager.uninstall(plugin.id); setRemoving(null); }}>{t('settings.plugins.manager.remove')}</Button>
+          <Button variant="ghost" size="sm" onClick={() => setRemoving(null)}>{t('common.cancel')}</Button>
+        </div> : <Button variant="ghost" size="sm" disabled={manager.busy} onClick={() => setRemoving(plugin.id)}>{t('settings.plugins.manager.remove')}</Button>}
+      </>}
+    </article>)}
+    </div>
+  </section>;
+}

components/settings/tabs/PluginPermissionPanel.test.tsx

@@ -0,0 +1,145 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { JSDOM } from 'jsdom';
+
+test('permission panel refreshes real grants, revokes once, and keeps stale reads from replacing new results', async () => {
+  const dom = new JSDOM('<!doctype html><html><body><div id="root"></div></body></html>', { pretendToBeVisual: true, url: 'http://localhost' });
+  const previous = new Map<string, PropertyDescriptor | undefined>();
+  const install = (key: string, value: unknown) => {
+    previous.set(key, Object.getOwnPropertyDescriptor(globalThis, key));
+    Object.defineProperty(globalThis, key, { configurable: true, writable: true, value });
+  };
+  for (const key of ['window', 'document', 'navigator', 'HTMLElement', 'Element', 'Node', 'Event', 'MouseEvent']) {
+    install(key, key === 'window' ? dom.window : dom.window[key as keyof typeof dom.window]);
+  }
+  install('IS_REACT_ACT_ENVIRONMENT', true);
+  const { default: React, act } = await import('react');
+  const { createRoot } = await import('react-dom/client');
+  const { I18nProvider } = await import('../../../application/i18n/I18nProvider');
+  const { PluginPermissionPanel } = await import('./PluginPermissionPanel');
+  const root = createRoot(document.getElementById('root')!);
+  const initial = {
+    grants: [{ permission: 'network', resource: 'https://synthetic.invalid/<text>', resourceKind: 'exact', scope: 'always' as const, sessionId: null, grantedAt: 1, matchesCurrentActivation: false }],
+    audit: [{ event: 'permission.used', createdAt: 2, permission: 'network' }],
+  };
+  let reads = 0;
+  let revokes = 0;
+  let changed = 0;
+  let staleRead: (value: typeof initial) => void = () => {};
+  let releaseRevoke: () => void = () => {};
+  const revokePending = new Promise<void>((resolve) => { releaseRevoke = resolve; });
+  Object.assign(dom.window, { netcatty: {
+    async getPluginPermissions(id: string) {
+      assert.equal(id, 'com.example.synthetic');
+      reads++;
+      if (reads === 2) return new Promise<typeof initial>((resolve) => { staleRead = resolve; });
+      return reads > 2 ? { grants: [], audit: [] } : initial;
+    },
+    async revokePluginPermissions(id: string) { assert.equal(id, 'com.example.synthetic'); revokes++; await revokePending; },
+  } });
+  const button = (text: string) => Array.from(document.querySelectorAll<HTMLButtonElement>('button')).find((item) => item.textContent === text)!;
+  try {
+    await act(async () => root.render(<I18nProvider locale="en"><PluginPermissionPanel pluginId="com.example.synthetic" onChanged={async () => { changed++; }} /></I18nProvider>));
+    assert.match(document.body.textContent!, /synthetic.invalid/);
+    assert.equal(document.querySelector('text'), null, 'resource is rendered as plain text');
+    assert.match(document.body.textContent!, /Until revoked/);
+    assert.match(document.body.textContent!, /Inactive for the current activation/);
+    await act(async () => { button('Refresh').click(); });
+    await act(async () => {
+      button('Disable and revoke all grants').click();
+      button('Disable and revoke all grants').click();
+    });
+    assert.equal(revokes, 1);
+    assert.equal(button('Refresh').disabled, true);
+    await act(async () => { releaseRevoke(); });
+    assert.equal(changed, 1);
+    assert.match(document.body.textContent!, /No saved grants/);
+    await act(async () => { staleRead(initial); });
+    assert.doesNotMatch(document.body.textContent!, /synthetic.invalid/);
+    Object.assign(dom.window, { netcatty: { async getPluginPermissions() { throw new Error('synthetic read failed'); } } });
+    await act(async () => { button('Refresh').click(); });
+    assert.match(document.querySelector('[role="alert"]')?.textContent ?? '', /synthetic read failed/);
+  } finally {
+    await act(async () => root.unmount());
+    dom.window.close();
+    for (const [key, descriptor] of previous) {
+      if (descriptor) Object.defineProperty(globalThis, key, descriptor);
+      else Reflect.deleteProperty(globalThis, key);
+    }
+  }
+});
+
+test('partial revocation failure refreshes actual manager and engine state without clearing the original error', async () => {
+  const dom = new JSDOM('<!doctype html><html><body><div id="root"></div></body></html>', { pretendToBeVisual: true, url: 'http://localhost' });
+  const previous = new Map<string, PropertyDescriptor | undefined>();
+  for (const key of ['window', 'document', 'navigator', 'HTMLElement', 'Element', 'Node', 'Event', 'MouseEvent', 'IS_REACT_ACT_ENVIRONMENT']) {
+    previous.set(key, Object.getOwnPropertyDescriptor(globalThis, key));
+    Object.defineProperty(globalThis, key, { configurable: true, writable: true, value: key === 'window' ? dom.window : key === 'IS_REACT_ACT_ENVIRONMENT' ? true : dom.window[key as keyof typeof dom.window] });
+  }
+  const { act } = await import('react');
+  const { createRoot } = await import('react-dom/client');
+  const { I18nProvider } = await import('../../../application/i18n/I18nProvider');
+  const { PluginPermissionPanel } = await import('./PluginPermissionPanel');
+  const { PluginManager } = await import('../../../electron/plugins/pluginManager.cjs');
+  const { PluginPermissionEngine } = await import('../../../electron/plugins/permissionEngine.cjs');
+  const { defaultSecurityPrincipal, normalizePermissionDeclarations, permissionDeclarationHash } = await import('../../../electron/plugins/permissionResources.cjs');
+  const manifest = { id: 'com.example.synthetic', publisher: 'example', permissions: { optional: ['storage'] } };
+  const principal = defaultSecurityPrincipal(manifest);
+  const grant = { pluginId: manifest.id, permission: 'storage', resource: '*', resourceKind: 'exact', grantedAt: 1,
+    declarationHash: permissionDeclarationHash(normalizePermissionDeclarations(manifest).get('storage'), principal) };
+  let enabled = true, running = true, stopped = false, readFails = false;
+  let grants = [grant];
+  let reads = 0, changed = 0;
+  const database = {
+    getActivePlugin: () => ({ id: manifest.id, enabled, manifest }),
+    listPlugins: () => [{ id: manifest.id, enabled, manifest }],
+    setEnabled(_id: string, value: boolean) { enabled = value; },
+    listPermissionGrants: () => grants,
+    deleteAllPermissionGrants() { grants = []; },
+    recordSecurityAudit() { throw new Error('synthetic audit write failed'); },
+  };
+  const engine = new PluginPermissionEngine({ database });
+  const manager = new PluginManager({ database, permissionEngine: engine,
+    packageStore: { async initialize() {} },
+    contributionService: { async initialize() {}, onPluginDisabled() {} },
+    runtimeSupervisor: { async stop() { running = false; stopped = true; } },
+  });
+  Object.assign(dom.window, { netcatty: {
+    async getPluginPermissions() {
+      reads++;
+      if (readFails) throw new Error('synthetic grants refresh failed');
+      const groups = engine.describeGrants(manifest.id, running ? { pluginId: manifest.id, manifest, securityPrincipal: principal } : null);
+      return { grants: groups.always, audit: [] };
+    },
+    async revokePluginPermissions(id: string) { return manager.revokePermissions(id); },
+  } });
+  const root = createRoot(document.getElementById('root')!);
+  const refreshManager = async () => { changed++; assert.equal((await manager.list())[0].enabled, false); };
+  const revoke = () => Array.from(document.querySelectorAll<HTMLButtonElement>('button')).find((item) => item.textContent === 'Disable and revoke all grants')!;
+  try {
+    await act(async () => root.render(<I18nProvider locale="en"><PluginPermissionPanel key="first" pluginId={manifest.id} onChanged={refreshManager} /></I18nProvider>));
+    assert.match(document.body.textContent!, /Matches the current activation/);
+    await act(async () => { revoke().click(); });
+    assert.equal(enabled, false); assert.equal(stopped, true);
+    assert.equal(changed, 1); assert.equal(reads, 2);
+    assert.match(document.querySelector('[role="alert"]')?.textContent ?? '', /synthetic audit write failed/);
+    assert.match(document.body.textContent!, /No saved grants/);
+    assert.doesNotMatch(document.body.textContent!, /Matches the current activation/);
+    // A failed state read must also remove the old grant snapshot while
+    // retaining the mutation error and reporting the refresh failure.
+    enabled = true; running = true; stopped = false; grants = [grant];
+    await act(async () => root.render(<I18nProvider locale="en"><PluginPermissionPanel key="second" pluginId={manifest.id} onChanged={async () => { await refreshManager(); readFails = true; throw new Error('synthetic manager refresh failed'); }} /></I18nProvider>));
+    assert.match(document.body.textContent!, /Matches the current activation/);
+    await act(async () => { revoke().click(); });
+    assert.equal(enabled, false); assert.equal(stopped, true);
+    assert.equal(changed, 2); assert.equal(reads, 4);
+    const error = document.querySelector('[role="alert"]')?.textContent ?? '';
+    assert.match(error, /synthetic audit write failed/);
+    assert.match(error, /synthetic manager refresh failed/);
+    assert.match(error, /synthetic grants refresh failed/);
+    assert.doesNotMatch(document.body.textContent!, /Matches the current activation/);
+  } finally {
+    await act(async () => root.unmount()); engine.shutdown(); dom.window.close();
+    for (const [key, descriptor] of previous) { if (descriptor) Object.defineProperty(globalThis, key, descriptor); else Reflect.deleteProperty(globalThis, key); }
+  }
+});

components/settings/tabs/PluginPermissionPanel.tsx

@@ -0,0 +1,86 @@
+import React, { useCallback, useEffect, useRef, useState } from 'react';
+import { netcattyBridge } from '../../../infrastructure/services/netcattyBridge';
+import { useI18n } from '../../../application/i18n/I18nProvider';
+import { describePluginPermission } from '../../../domain/pluginPermissionDescriptions.cjs';
+import { Button } from '../../ui/button';
+
+/** Host UI only. Plugin views cannot query or mutate this security state. */
+export function PluginPermissionPanel({ pluginId, onChanged }: {
+  pluginId: string;
+  onChanged: () => Promise<void>;
+}) {
+  const { t, resolvedLocale } = useI18n();
+  const [snapshot, setSnapshot] = useState<NetcattyPluginPermissionSnapshot | null>(null);
+  const [error, setError] = useState<string | null>(null);
+  const [busy, setBusy] = useState(false);
+  const generation = useRef(0);
+  const pending = useRef(false);
+  const refresh = useCallback(async (preserveError = false) => {
+    const current = ++generation.current;
+    if (!preserveError) setError(null);
+    try {
+      const bridge = netcattyBridge.require();
+      if (!bridge.getPluginPermissions) throw new Error(t('settings.plugins.permissions.unavailable'));
+      const result = await bridge.getPluginPermissions(pluginId);
+      if (current === generation.current) setSnapshot(result);
+    } catch (cause) {
+      if (current === generation.current) {
+        setSnapshot(null);
+        const message = cause instanceof Error ? cause.message : String(cause);
+        setError((previous) => preserveError && previous ? `${previous}\n${message}` : message);
+      }
+    }
+  }, [pluginId, t]);
+  useEffect(() => {
+    const requestGeneration = generation;
+    void refresh();
+    return () => { requestGeneration.current++; };
+  }, [refresh]);
+  const revoke = async () => {
+    if (pending.current) return;
+    pending.current = true;
+    setBusy(true);
+    setError(null);
+    try {
+      const bridge = netcattyBridge.require();
+      if (!bridge.revokePluginPermissions) throw new Error(t('settings.plugins.permissions.unavailable'));
+      await bridge.revokePluginPermissions(pluginId);
+    } catch (cause) { setError(cause instanceof Error ? cause.message : String(cause)); }
+    finally {
+      try { await onChanged(); }
+      catch (cause) {
+        const message = cause instanceof Error ? cause.message : String(cause);
+        setError((previous) => previous ? `${previous}\n${message}` : message);
+      }
+      await refresh(true);
+      pending.current = false; setBusy(false);
+    }
+  };
+  return <section data-host-security-surface="" className="space-y-3 border-t border-border/60 pt-4 text-sm" aria-label={t('settings.plugins.permissions.title')}>
+    <div className="flex flex-wrap items-center justify-between gap-2">
+      <h4 className="font-medium">{t('settings.plugins.permissions.title')}</h4>
+      <Button variant="ghost" size="sm" disabled={busy} onClick={() => void refresh()}>{t('settings.plugins.permissions.refresh')}</Button>
+    </div>
+    {error && <p role="alert" className="text-xs text-destructive">{error}</p>}
+    {!snapshot && !error && <p role="status">{t('settings.plugins.permissions.loading')}</p>}
+    {snapshot && <>
+      {snapshot.grants.length === 0 && <p className="text-xs text-muted-foreground">{t('settings.plugins.permissions.empty')}</p>}
+      {snapshot.grants.map((grant, index) => <div key={index} className="rounded-md bg-muted/40 p-3 text-xs">
+        <p className="font-medium">{describePluginPermission(grant.permission, resolvedLocale).label}</p>
+        <p className="whitespace-pre-wrap break-all font-mono">{grant.resource}</p>
+        <p>{t(grant.matchesCurrentActivation ? 'settings.plugins.permissions.current' : 'settings.plugins.permissions.inactive')}</p>
+        <p>{t(`settings.plugins.permissions.${grant.scope}`)}{grant.sessionId ? ` · ${grant.sessionId}` : ''}</p>
+        <time dateTime={new Date(grant.grantedAt).toISOString()}>{new Date(grant.grantedAt).toLocaleString(resolvedLocale)}</time>
+      </div>)}
+      <details className="text-xs">
+        <summary className="cursor-pointer">{t('settings.plugins.permissions.audit')}</summary>
+        <ol className="mt-2 space-y-1">{snapshot.audit.map((entry, index) => <li key={index} className="break-words">
+          <time dateTime={new Date(entry.createdAt).toISOString()}>{new Date(entry.createdAt).toLocaleString(resolvedLocale)}</time>{' · '}
+          {entry.event}{entry.permission ? ` · ${entry.permission}` : ''}{entry.scope ? ` · ${entry.scope}` : ''}
+        </li>)}</ol>
+      </details>
+      <p className="text-xs text-muted-foreground">{t('settings.plugins.permissions.revokeNote')}</p>
+      <Button variant="destructive" size="sm" disabled={busy} onClick={() => void revoke()}>{t('settings.plugins.permissions.revoke')}</Button>
+    </>}
+  </section>;
+}

components/settings/tabs/PluginReadme.test.tsx

@@ -0,0 +1,14 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import React from 'react';
+import { renderToStaticMarkup } from 'react-dom/server';
+import { PluginReadme } from './PluginReadme';
+
+test('README never creates active HTML, remote media or script links', () => {
+  const html = renderToStaticMarkup(<PluginReadme markdown={'# Example\n\n<script>alert(1)</script>\n\n<img src="https://tracker.example/pixel">\n\n![track](https://tracker.example/x.svg)\n\n[run](javascript:alert%281%29)\n\n[docs](https://example.com)\n\n```html\n<iframe src="file:///secret">\n```'} />);
+  assert.doesNotMatch(html, /<(script|img|iframe|svg)\b/);
+  assert.doesNotMatch(html, /href="(javascript|file):/);
+  assert.match(html, /href="https:\/\/example.com"/);
+  assert.match(html, /rel="noopener noreferrer"/);
+  assert.match(html, /&lt;script&gt;/);
+});

components/settings/tabs/PluginReadme.tsx

@@ -0,0 +1,37 @@
+import React, { useMemo } from 'react';
+import { fromMarkdown } from 'mdast-util-from-markdown';
+import type { RootContent, Root } from 'mdast';
+
+function renderNode(node: Root | RootContent, key: number, depth = 0): React.ReactNode {
+  if (depth > 24) return null;
+  const children = 'children' in node ? node.children.map((child, index) => renderNode(child as RootContent, index, depth + 1)) : null;
+  switch (node.type) {
+    case 'root': return <React.Fragment key={key}>{children}</React.Fragment>;
+    case 'heading': return <h4 key={key} className="mt-5 font-semibold">{children}</h4>;
+    case 'paragraph': return <p key={key} className="my-2 leading-relaxed">{children}</p>;
+    case 'text': return node.value;
+    case 'strong': return <strong key={key}>{children}</strong>;
+    case 'emphasis': return <em key={key}>{children}</em>;
+    case 'inlineCode': return <code key={key} className="rounded bg-muted px-1">{node.value}</code>;
+    case 'code': return <pre key={key} className="my-3 overflow-auto rounded-lg bg-muted p-3 text-xs"><code>{node.value}</code></pre>;
+    case 'list': return <ul key={key} className="my-2 list-disc pl-5">{children}</ul>;
+    case 'listItem': return <li key={key}>{children}</li>;
+    case 'blockquote': return <blockquote key={key} className="border-l-2 pl-3 text-muted-foreground">{children}</blockquote>;
+    case 'break': return <br key={key} />;
+    case 'thematicBreak': return <hr key={key} />;
+    case 'link': {
+      let safe = false;
+      try { const url = new URL(node.url); safe = url.protocol === 'https:' && !url.username && !url.password; } catch { /* relative and unsafe links stay text */ }
+      return safe ? <a key={key} href={node.url} target="_blank" rel="noopener noreferrer" className="underline">{children}</a> : <span key={key}>{children}</span>;
+    }
+    // Never embed HTML, media, SVG, iframes, remote images, or reference URLs.
+    case 'image': return <span key={key} className="text-muted-foreground">[{node.alt ?? 'image'}]</span>;
+    case 'html': return <span key={key}>{node.value}</span>;
+    default: return <React.Fragment key={key}>{children}</React.Fragment>;
+  }
+}
+
+export function PluginReadme({ markdown }: { markdown: string }) {
+  const tree = useMemo(() => fromMarkdown(markdown.slice(0, 256 * 1024)), [markdown]);
+  return <div className="break-words text-sm">{renderNode(tree, 0)}</div>;
+}

components/settings/tabs/PluginStatePill.test.tsx

@@ -0,0 +1,43 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import React from 'react';
+import { act, create, type ReactTestRenderer } from 'react-test-renderer';
+import { I18nProvider } from '../../../application/i18n/I18nProvider';
+import { PluginPackageManager } from './PluginPackageManager';
+import type { usePluginManager } from '../../../application/state/usePluginManager';
+
+test('state pill exposes actual state, opposite action, focus styling and pending disable without granting permissions', async () => {
+  const globals = globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean };
+  const previous = globals.IS_REACT_ACT_ENVIRONMENT; globals.IS_REACT_ACT_ENVIRONMENT = true;
+  const calls: unknown[] = [];
+  const plugin = { id: 'com.test.pill', activeVersion: '1.0.0', enabled: true, manifest: { name: 'Pill' }, runtime: {} } as NetcattyInstalledPlugin;
+  const manager = { available: true, plugins: [plugin], busy: false, setEnabled: async (...args: unknown[]) => { calls.push(args); } } as unknown as ReturnType<typeof usePluginManager>;
+  let renderer: ReactTestRenderer;
+  const render = (enabled: boolean, busy = false) => <I18nProvider locale="en"><PluginPackageManager manager={{ ...manager, busy, plugins: [{ ...plugin, enabled }] }} /></I18nProvider>;
+  try {
+    await act(async () => { renderer = create(render(true)); });
+    const pill = () => renderer.root.findAllByType('button').find((node) => node.props['aria-pressed'] !== undefined)!;
+    assert.equal(pill().props['aria-pressed'], true);
+    const logoSlot = renderer.root.findAllByType('div').find((node) => node.props.className === 'flex h-12 w-12 shrink-0 items-center justify-center');
+    assert.ok(logoSlot, 'logo keeps its 48px layout slot without an extra decorative background');
+    assert.equal(pill().props['aria-label'], 'Disable Pill');
+    assert.ok(pill().children.includes('Enabled'));
+    assert.match(pill().props.className, /rounded-full/);
+    assert.match(pill().props.className, /border-0/);
+    assert.doesNotMatch(pill().props.className, /border-primary|border-border/);
+    assert.match(pill().props.className, /bg-primary\/10/);
+    assert.match(pill().props.className, /focus-visible:ring-2/);
+    assert.match(pill().props.style.color, /--primary/);
+    await act(async () => pill().props.onClick());
+    assert.deepEqual(calls, [['com.test.pill', false]]);
+    await act(async () => renderer.update(render(false, true)));
+    assert.equal(pill().props['aria-pressed'], false);
+    assert.equal(pill().props['aria-label'], 'Enable Pill');
+    assert.ok(pill().children.includes('Disabled'));
+    assert.equal(pill().props.disabled, true);
+    assert.equal(pill().props['aria-busy'], true);
+    assert.match(pill().props.className, /bg-muted/);
+    assert.equal(pill().props.style, undefined);
+    await act(async () => renderer.unmount());
+  } finally { globals.IS_REACT_ACT_ENVIRONMENT = previous; }
+});

components/settings/tabs/PluginStatus.tsx

@@ -0,0 +1,14 @@
+import React from 'react';
+import { useI18n } from '../../../application/i18n/I18nProvider';
+import { Button } from '../../ui/button';
+import { PluginInfo } from './PluginInfo';
+
+export function PluginStatus({ noVault, offlineError, retry }: { noVault?: boolean; offlineError?: string | null; retry?: () => void }) {
+  const { t } = useI18n();
+  const count = Number(Boolean(noVault)) + Number(Boolean(offlineError));
+  const explanation = <>{noVault && <p>{t('settings.plugins.manager.noVault')}</p>}{offlineError && <><p>{t('settings.plugins.market.offline')}</p><p className="break-words">{offlineError}</p></>}</>;
+  const label = count ? `${t('settings.plugins.info')} · ${t('settings.plugins.status', { count })}` : t('settings.plugins.info');
+  const help = <><p>{t('settings.plugins.manager.preview')}</p><p>{t('settings.plugins.market.note')}</p></>;
+  const preview = <>{count > 0 && <p>{t('settings.plugins.status', { count })}</p>}{explanation}{help}</>;
+  return <PluginInfo label={label} badgeCount={count} previewContent={preview}>{explanation}{offlineError && retry && <Button variant="outline" size="sm" onClick={retry}>{t('settings.plugins.market.retry')}</Button>}{count > 0 && <hr className="border-border/60" />}{help}</PluginInfo>;
+}

components/settings/tabs/PluginThemePicker.test.tsx

@@ -0,0 +1,230 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+import { JSDOM } from "jsdom";
+import type {
+  ThemePackCatalog,
+  ThemePackEntry,
+} from "@netcatty/plugin-contract";
+
+test("host theme picker previews without persistence, applies, restores, and cancels stale owners safely", async () => {
+  const dom = new JSDOM(
+    '<!doctype html><html><body><div id="root"></div></body></html>',
+    { url: "http://localhost", pretendToBeVisual: true },
+  );
+  const previous = new Map<string, PropertyDescriptor | undefined>();
+  for (const key of [
+    "window",
+    "document",
+    "navigator",
+    "HTMLElement",
+    "Element",
+    "Node",
+    "Event",
+    "MouseEvent",
+    "IS_REACT_ACT_ENVIRONMENT",
+  ]) {
+    previous.set(key, Object.getOwnPropertyDescriptor(globalThis, key));
+    Object.defineProperty(globalThis, key, {
+      configurable: true,
+      writable: true,
+      value:
+        key === "IS_REACT_ACT_ENVIRONMENT"
+          ? true
+          : key === "window"
+            ? dom.window
+            : dom.window[key as keyof typeof dom.window],
+    });
+  }
+  const { default: React, act, useLayoutEffect } = await import("react");
+  const { createRoot } = await import("react-dom/client");
+  const { I18nProvider } = await import(
+    "../../../application/i18n/I18nProvider"
+  );
+  const { PluginThemePicker } = await import("./PluginThemePicker");
+  const { pluginThemeRegistry: registry } = await import(
+    "../../../infrastructure/config/pluginThemeRegistry"
+  );
+  const { usePluginThemeRevision } = await import(
+    "../../../application/state/usePluginThemeRuntime"
+  );
+  const { getUiThemeById } = await import(
+    "../../../infrastructure/config/uiThemes"
+  );
+  const { applyThemeTokens } = await import(
+    "../../../application/state/settingsStateDefaults"
+  );
+  const entry: ThemePackEntry = {
+    ref: {
+      pluginId: "com.example.theme",
+      themeId: "com.example.theme.forest",
+      version: "1.0.0",
+      digest: "a".repeat(64),
+      variant: "light",
+    },
+    label: "Forest",
+    pluginName: "Synthetic Theme",
+    dataOnly: true,
+    palette: { formatVersion: 1, base: "light", colors: { accent: "#166534" } },
+  };
+  let writes = 0,
+    restores = 0;
+  let catalog: ThemePackCatalog = {
+    selection: {
+      formatVersion: 1,
+      revision: registry.getCatalog().selection.revision + 1,
+      light: null,
+      dark: null,
+    },
+    entries: [entry],
+    diagnostics: [],
+  };
+  registry.setCatalog(catalog);
+  Object.assign(dom.window, {
+    netcatty: {
+      async applyPluginTheme(request: {
+        expectedRevision: number;
+        choice: ThemePackCatalog["selection"]["light"];
+      }) {
+        assert.equal(request.expectedRevision, catalog.selection.revision);
+        writes++;
+        catalog = {
+          ...catalog,
+          selection: {
+            ...catalog.selection,
+            revision: catalog.selection.revision + 1,
+            light: request.choice,
+          },
+        };
+        registry.setCatalog(catalog);
+        return catalog;
+      },
+    },
+  });
+  function Fixture() {
+    const revision = usePluginThemeRevision();
+    useLayoutEffect(
+      () =>
+        applyThemeTokens(
+          "light",
+          "light",
+          getUiThemeById("light", "snow").tokens,
+          "theme",
+          "",
+        ),
+      [revision],
+    );
+    return (
+      <I18nProvider locale="en">
+        <PluginThemePicker mode="light" onRestore={() => restores++} />
+      </I18nProvider>
+    );
+  }
+  const root = createRoot(document.getElementById("root")!);
+  const button = (label: string) =>
+    [...document.querySelectorAll<HTMLButtonElement>("button")].find(
+      (b) => b.textContent === label,
+    )!;
+  try {
+    await act(async () => root.render(<Fixture />));
+    const original =
+      document.documentElement.style.getPropertyValue("--primary");
+    await act(async () => {
+      const select = document.querySelector("select")!;
+      select.value = `${entry.ref.pluginId}/${entry.ref.themeId}`;
+      select.dispatchEvent(new Event("change", { bubbles: true }));
+    });
+    await act(async () => button("Preview").click());
+    assert.equal(writes, 0);
+    assert.equal(
+      getUiThemeById("light", "snow", false).tokens.primary,
+      original,
+      "local preview does not enter the global plugin view environment",
+    );
+    assert.notEqual(
+      document.documentElement.style.getPropertyValue("--primary"),
+      original,
+    );
+    assert.ok(
+      document.documentElement.hasAttribute("data-plugin-theme-active"),
+    );
+    assert.ok(
+      document.documentElement.style.getPropertyValue(
+        "--host-security-primary",
+      ),
+    );
+    await act(async () => button("Cancel preview").click());
+    assert.equal(
+      document.documentElement.style.getPropertyValue("--primary"),
+      original,
+    );
+    assert.equal(writes, 0);
+    await act(async () => {
+      button("Preview").click();
+      button("Apply").click();
+    });
+    assert.equal(writes, 1);
+    assert.equal(catalog.selection.light?.ref.themeId, entry.ref.themeId);
+    await act(async () => button("Restore default").click());
+    assert.equal(writes, 2);
+    assert.equal(restores, 1);
+    assert.equal(catalog.selection.light, null);
+    await act(async () => {
+      registry.startPreview("old-owner", entry);
+      registry.startPreview("new-owner", entry);
+      registry.cancelPreview("old-owner");
+    });
+    assert.notEqual(
+      document.documentElement.style.getPropertyValue("--primary"),
+      original,
+    );
+    await act(async () =>
+      registry.setCatalog({
+        ...catalog,
+        selection: {
+          ...catalog.selection,
+          revision: catalog.selection.revision + 1,
+        },
+        entries: [],
+      }),
+    );
+    assert.equal(
+      document.documentElement.style.getPropertyValue("--primary"),
+      original,
+      "package withdrawal cancels previews",
+    );
+    await act(async () =>
+      registry.setCatalog({
+        ...catalog,
+        selection: {
+          ...catalog.selection,
+          revision: catalog.selection.revision + 2,
+          light: { ref: entry.ref },
+        },
+        entries: [],
+      }),
+    );
+    assert.equal(getUiThemeById("light", "snow").id, "host-plugin-fallback");
+    await act(async () => registry.setHighContrast(true));
+    assert.equal(getUiThemeById("light", "snow").id, "host-high-contrast");
+  } finally {
+    await act(async () => {
+      root.unmount();
+      registry.setHighContrast(false);
+      registry.setCatalog({
+        ...catalog,
+        selection: {
+          formatVersion: 1,
+          revision: registry.getCatalog().selection.revision + 1,
+          light: null,
+          dark: null,
+        },
+        entries: [],
+      });
+    });
+    dom.window.close();
+    for (const [key, descriptor] of previous) {
+      if (descriptor) Object.defineProperty(globalThis, key, descriptor);
+      else Reflect.deleteProperty(globalThis, key);
+    }
+  }
+});

components/settings/tabs/PluginThemePicker.tsx

@@ -0,0 +1,166 @@
+import { useEffect, useId, useState } from "react";
+import { useI18n } from "../../../application/i18n/I18nProvider";
+import {
+  applyPluginThemeSelection,
+  usePluginThemeRevision,
+} from "../../../application/state/usePluginThemeRuntime";
+import { pluginThemeRegistry } from "../../../infrastructure/config/pluginThemeRegistry";
+import { Button } from "../../ui/button";
+
+export function PluginThemePicker({
+  mode,
+  onRestore,
+}: {
+  mode: "light" | "dark";
+  onRestore: () => void;
+}) {
+  const { t } = useI18n();
+  usePluginThemeRevision();
+  const owner = useId();
+  const [selected, setSelected] = useState(""),
+    [pending, setPending] = useState(false),
+    [error, setError] = useState("");
+  const catalog = pluginThemeRegistry.getCatalog();
+  const entries = catalog.entries.filter((e) => e.palette.base === mode);
+  const applied = catalog.selection[mode];
+  const appliedAvailable =
+    applied &&
+    entries.some(
+      (e) =>
+        e.ref.pluginId === applied.ref.pluginId &&
+        e.ref.themeId === applied.ref.themeId &&
+        e.ref.version === applied.ref.version &&
+        e.ref.digest === applied.ref.digest,
+    );
+  const entry = entries.find(
+    (e) => `${e.ref.pluginId}/${e.ref.themeId}` === selected,
+  );
+  useEffect(
+    () => () => pluginThemeRegistry.cancelPreview(owner),
+    [owner, mode],
+  );
+  async function apply(restore = false) {
+    if (pending || (!restore && !entry)) return;
+    setPending(true);
+    setError("");
+    try {
+      await applyPluginThemeSelection(
+        mode,
+        restore ? null : { ref: entry!.ref },
+      );
+      pluginThemeRegistry.cancelPreview(owner);
+      if (restore) {
+        setSelected("");
+        onRestore();
+      }
+    } catch (e) {
+      setError(
+        e instanceof Error ? e.message : t("settings.plugins.themes.failed"),
+      );
+    } finally {
+      setPending(false);
+    }
+  }
+  return (
+    <section
+      className="space-y-3 py-3"
+      aria-label={t("settings.plugins.themes.title")}
+    >
+      <div>
+        <h4 className="text-sm font-medium">
+          {t("settings.plugins.themes.title")}
+        </h4>
+        <p className="text-xs text-muted-foreground">
+          {t("settings.plugins.themes.description")}
+        </p>
+      </div>
+      {entries.length === 0 ? (
+        <p className="text-xs text-muted-foreground">
+          {t("settings.plugins.themes.empty")}
+        </p>
+      ) : (
+        <select
+          className="h-9 w-full rounded-md border border-input bg-background px-3 text-sm"
+          aria-label={t("settings.plugins.themes.choose")}
+          value={entry ? selected : ""}
+          disabled={pending}
+          onChange={(e) => {
+            pluginThemeRegistry.cancelPreview(owner);
+            setSelected(e.target.value);
+            setError("");
+          }}
+        >
+          <option value="">{t("settings.plugins.themes.choose")}</option>
+          {entries.map((e) => (
+            <option
+              key={`${e.ref.pluginId}/${e.ref.themeId}`}
+              value={`${e.ref.pluginId}/${e.ref.themeId}`}
+            >
+              {e.label} — {e.pluginName} {e.ref.version}
+            </option>
+          ))}
+        </select>
+      )}
+      {catalog.selection[mode] && (
+        <p className="text-xs text-muted-foreground">
+          {t(
+            appliedAvailable
+              ? "settings.plugins.themes.applied"
+              : "settings.plugins.themes.unavailable",
+          )}
+          : {catalog.selection[mode]!.ref.themeId} ·{" "}
+          {catalog.selection[mode]!.ref.version}
+        </p>
+      )}
+      <div className="flex flex-wrap gap-2">
+        <Button
+          size="sm"
+          variant="outline"
+          disabled={!entry || pending}
+          onClick={() => {
+            if (entry) pluginThemeRegistry.startPreview(owner, entry);
+          }}
+        >
+          {t("settings.plugins.themes.preview")}
+        </Button>
+        <Button
+          size="sm"
+          disabled={!entry || pending}
+          onClick={() => {
+            void apply();
+          }}
+        >
+          {t("settings.plugins.themes.apply")}
+        </Button>
+        <Button
+          size="sm"
+          variant="ghost"
+          disabled={pending}
+          onClick={() => pluginThemeRegistry.cancelPreview(owner)}
+        >
+          {t("settings.plugins.themes.cancel")}
+        </Button>
+        <Button
+          size="sm"
+          variant="outline"
+          disabled={pending}
+          onClick={() => {
+            void apply(true);
+          }}
+        >
+          {t("settings.plugins.themes.restore")}
+        </Button>
+      </div>
+      {catalog.diagnostics.length > 0 && (
+        <p className="text-xs text-muted-foreground">
+          {t("settings.plugins.themes.invalid")}
+        </p>
+      )}
+      {error && (
+        <p role="alert" className="text-xs text-destructive">
+          {error}
+        </p>
+      )}
+    </section>
+  );
+}

components/settings/tabs/SettingsAppearanceTab.tsx

@@ -1,3 +1,6 @@
+import { PluginThemePicker } from './PluginThemePicker';
+import { applyPluginThemeSelection, usePluginThemeRevision } from '../../../application/state/usePluginThemeRuntime';
+import { pluginThemeRegistry } from '../../../infrastructure/config/pluginThemeRegistry';
 import React, { memo, useCallback, useMemo, useState } from "react";
 import { applyCustomCssToDocument } from "../../../lib/customCss";
 import { DebouncedTextarea } from "../DebouncedTextarea";
@@ -70,6 +73,8 @@ function SettingsAppearanceTab(props: {
   setAppIconVariant: (variant: AppIconVariant) => void;
 }) {
   const { t } = useI18n();
+  usePluginThemeRevision();
+  const [pluginThemeError, setPluginThemeError] = useState('');
   const availableUIFonts = useAvailableUIFonts();
   // Note code fonts come from the monospace-only store (fontStore); the note
   // body font follows the UI font setting instead.
@@ -231,8 +236,12 @@ function SettingsAppearanceTab(props: {
   );
 
   const visibleUiThemes = resolvedTheme === "dark" ? DARK_UI_THEMES : LIGHT_UI_THEMES;
-  const visibleUiThemeId = resolvedTheme === "dark" ? darkUiThemeId : lightUiThemeId;
-  const setVisibleUiThemeId = resolvedTheme === "dark" ? setDarkUiThemeId : setLightUiThemeId;
+  const visibleUiThemeId = pluginThemeRegistry.isActive(resolvedTheme) ? "" : resolvedTheme === "dark" ? darkUiThemeId : lightUiThemeId;
+  const setVisibleUiThemeId = (id: string) => {
+    void applyPluginThemeSelection(resolvedTheme, null).then(() => {
+      (resolvedTheme === "dark" ? setDarkUiThemeId : setLightUiThemeId)(id);setPluginThemeError('');
+    }).catch((error: unknown) => setPluginThemeError(error instanceof Error ? error.message : t('settings.plugins.themes.failed')));
+  };
 
   return (
     <SettingsTabContent value="appearance">
@@ -339,6 +348,8 @@ function SettingsAppearanceTab(props: {
             {renderThemeSwatches(visibleUiThemes, visibleUiThemeId, setVisibleUiThemeId)}
           </div>
         </SettingsAnchor>
+        <PluginThemePicker mode={resolvedTheme} onRestore={() => (resolvedTheme === "dark" ? setDarkUiThemeId : setLightUiThemeId)(resolvedTheme === "dark" ? "midnight" : "snow")} />
+        {pluginThemeError && <p role="alert" className="text-xs text-destructive">{pluginThemeError}</p>}
         <SettingRow
           anchorId="appearance-accent-mode"
           label={t("settings.appearance.accentColor.mode")}

components/settings/tabs/SettingsPluginsTab.tsx

@@ -1,9 +1,15 @@
+import { usePluginManager } from '../../../application/state/usePluginManager';
+import { PluginManagementDialog } from './PluginManagementDialog';
+import { PluginMarketplace } from './PluginMarketplace';
+import { PluginPackageManager } from './PluginPackageManager';
 import { FolderOpen } from 'lucide-react';
+import { PluginStatus } from './PluginStatus';
 import React, { useEffect, useMemo, useState } from 'react';
 
 import { normalizePluginKeyboardEvent } from '../../../application/state/pluginKeybindings';
 import { usePluginContributions } from '../../../application/state/usePluginContributions';
 import { useI18n } from '../../../application/i18n/I18nProvider';
+import { Tabs, TabsContent, TabsList, TabsTrigger } from '../../ui/tabs';
 import { Button } from '../../ui/button';
 import { Input } from '../../ui/input';
 import { SettingsAnchor, SettingsTabContent } from '../settings-ui';
@@ -278,8 +284,12 @@ export function PluginSettingField({
   );
 }
 
-export default function SettingsPluginsTab() {
+function PluginManagementContent({ handoff }: { handoff: (action: () => void) => void }) {
   const { t } = useI18n();
+  const manager = usePluginManager();
+  const [catalogToolbar, setCatalogToolbar] = useState<HTMLDivElement | null>(null);
+  const [selectedInstalled, setSelectedInstalled] = useState<string | null>(null);
+  const [pluginView, setPluginView] = useState<'installed' | 'marketplace'>('installed');
   const availableFonts = useAvailableFonts();
   const scopeCatalog = usePluginSettingScopeCatalog();
   const [scopeIds, setScopeIds] = useState<Partial<Record<NetcattyPluginSettingScopeKind, string>>>({});
@@ -292,21 +302,29 @@ export default function SettingsPluginsTab() {
   }), [scopeIds]);
   const contributions = usePluginContributions(query);
   const contextualScopes = useMemo(() => new Set(contributions.snapshot.plugins
+    .filter((plugin) => plugin.id === selectedInstalled)
     .flatMap((plugin) => plugin.settings.map((setting) => setting.scope))
     .filter((scope): scope is NetcattyPluginSettingScopeKind => scope !== 'application')),
-  [contributions.snapshot.plugins]);
-  const hasVisibleContributions = contributions.snapshot.plugins.some((plugin) => (
-    plugin.settings.some((setting) => setting.visible)
-    || plugin.views.some((view) => view.visible && view.location === 'settings')
-  ));
+  [contributions.snapshot.plugins, selectedInstalled]);
+
 
   return (
-    <SettingsTabContent value="plugins">
-      <SettingsAnchor anchorId="plugins-root" className="mx-auto w-full max-w-3xl space-y-6 px-8 py-8">
-        <div>
-          <h2 className="text-xl font-semibold">{t('settings.plugins.title')}</h2>
-          <p className="mt-1 text-sm text-muted-foreground">{t('settings.plugins.description')}</p>
+    <div className="space-y-5">
+        <Tabs value={pluginView} onValueChange={(value) => { setSelectedInstalled(null); setPluginView(value as 'installed' | 'marketplace'); }} className="space-y-5">
+        <div className="flex flex-wrap items-center justify-between gap-3">
+          <TabsList className="h-auto flex-wrap justify-start bg-muted/50">
+            <TabsTrigger value="installed">{t('settings.plugins.manager.installed')} <span className="ml-2 text-muted-foreground">{manager.plugins.length}</span></TabsTrigger>
+            <TabsTrigger value="marketplace">{t('settings.plugins.market.title')}</TabsTrigger>
+          </TabsList>
+          <div className="flex items-center gap-2">
+          {pluginView === 'installed' && <PluginStatus noVault={manager.credentialStorageAvailable === false} />}
+          <div ref={setCatalogToolbar} className="flex items-center gap-2" />
+          <Button variant="outline" size="sm" disabled={!manager.available || manager.busy} onClick={() => { setPluginView('installed'); void manager.importPackage(); }}><FolderOpen size={14} className="mr-2" />{t('settings.plugins.manager.import')}</Button>
+          </div>
         </div>
+        <TabsContent value="marketplace" className="m-0 space-y-6"><PluginMarketplace installed={manager.plugins} toolbarContainer={catalogToolbar} noVault={manager.credentialStorageAvailable === false} /></TabsContent>
+        <TabsContent value="installed" className="m-0 space-y-6">
+        <PluginPackageManager manager={manager} onSelectionChange={setSelectedInstalled} />
         {contextualScopes.size > 0 && (
           <section className="grid gap-3 rounded-lg border border-border/70 bg-muted/10 p-4 sm:grid-cols-2" aria-label={t('settings.plugins.scopeTargets')}>
             {[...contextualScopes].map((kind) => (
@@ -326,7 +344,7 @@ export default function SettingsPluginsTab() {
         )}
         {contributions.loading && <p className="text-sm text-muted-foreground">{t('settings.plugins.loading')}</p>}
         {contributions.error && <p role="alert" className="text-sm text-destructive">{contributions.error.message}</p>}
-        {contributions.snapshot.plugins.map((plugin) => {
+        {contributions.snapshot.plugins.filter((plugin) => plugin.id === selectedInstalled).map((plugin) => {
           const settings = plugin.settings.filter((setting) => setting.visible);
           const views = plugin.views.filter((view) => view.visible && view.location === 'settings');
           if (!settings.length && !views.length) return null;
@@ -356,18 +374,32 @@ export default function SettingsPluginsTab() {
                     <div className="font-mono text-[10px] text-muted-foreground">{view.id}</div>
                     </div>
                   </div>
-                  <Button type="button" variant="outline" size="sm" onClick={() => requestOpenPluginView({
+                  <Button type="button" variant="outline" size="sm" onClick={() => handoff(() => requestOpenPluginView({
                     viewId: view.id,
                     context: { 'netcatty.surface': 'settings' },
-                  })}>{t('common.open')}</Button>
+                  }))}>{t('settings.plugins.openView')}</Button>
                 </div>
               ))}
             </section>
           );
         })}
-        {!contributions.loading && contributions.available && !hasVisibleContributions && (
-          <p className="text-sm text-muted-foreground">{t('settings.plugins.empty')}</p>
-        )}
+        </TabsContent>
+        </Tabs>
+    </div>
+  );
+}
+
+
+export default function SettingsPluginsTab() {
+  const { t } = useI18n();
+  return (
+    <SettingsTabContent value="plugins">
+      <SettingsAnchor anchorId="plugins-root" className="space-y-5">
+        <div>
+          <h2 className="text-xl font-semibold">{t('settings.plugins.title')}</h2>
+          <p className="mt-1 text-sm text-muted-foreground">{t('settings.plugins.description')}</p>
+        </div>
+        <PluginManagementDialog>{(handoff) => <PluginManagementContent handoff={handoff} />}</PluginManagementDialog>
       </SettingsAnchor>
     </SettingsTabContent>
   );

components/settings/tabs/plugin-marketplace.css

@@ -0,0 +1,9 @@
+.plugin-marketplace-browser { min-width: 0; }
+.plugin-marketplace-catalog { min-width: 0; }
+.plugin-marketplace-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr)); gap: 16px; }
+/* Details use only the manager's main scrolling surface at every width. */
+.plugin-marketplace-detail { overflow-wrap: anywhere; }
+.plugin-card { box-shadow: 0 1px 4px hsl(var(--foreground) / 0.06); }
+.plugin-card:hover { box-shadow: 0 2px 8px hsl(var(--foreground) / 0.09); }
+.dark .plugin-card { background: hsl(var(--muted) / 0.2); box-shadow: none; }
+.dark .plugin-card:hover { background: hsl(var(--muted) / 0.3); box-shadow: none; }

components/terminal/TerminalHostKeyVerification.tsx

@@ -30,7 +30,7 @@ export const TerminalHostKeyVerification: React.FC<TerminalHostKeyVerificationPr
     const Icon = isChanged ? AlertTriangle : Fingerprint;
 
     return (
-        <div className="space-y-3 animate-in fade-in-0 slide-in-from-bottom-1 duration-200">
+        <div data-host-security-surface="" className="space-y-3 animate-in fade-in-0 slide-in-from-bottom-1 duration-200">
             <div
                 className={cn(
                     "rounded-xl border px-3 py-2.5",

components/terminal/TerminalToolbar.tsx

@@ -44,6 +44,7 @@ import { collectOwnedPluginMenus, comparePluginMenus, usePluginContributions } f
 import { buildTerminalPluginContributionContext } from '../../application/state/pluginContributionContexts';
 import { PluginContributionIcon } from '../plugins/PluginContributionIcon';
 import { isPluginHostProtocol } from '../../domain/pluginConnection';
+import { PluginTerminalSidebarLauncher } from '../plugins/PluginTerminalSidebar';
 
 export const TERMINAL_TOOLBAR_ITEM_IDS = [
   'highlight',
@@ -1158,6 +1159,7 @@ export const TerminalToolbar: React.FC<TerminalToolbarProps> = ({
         )}
         </ToolbarCustomizeContextMenu>
 
+        {!compactToolbar && <PluginTerminalSidebarLauncher sessionId={sessionId} />}
         {pluginToolbarMenus.map((menu) => (
         <Tooltip key={menu.id}>
           <TooltipTrigger asChild>

components/terminalLayer/TerminalLayerSidePanelSection.tsx

@@ -9,7 +9,7 @@ import React, { memo, useCallback, useEffect, useLayoutEffect, useMemo, useRef,
 import { createPortal } from 'react-dom';
 import * as SelectPrimitive from '@radix-ui/react-select';
 
-import { useActiveTabId } from '../../application/state/activeTabStore';
+import { activeTabStore, useActiveTabId } from '../../application/state/activeTabStore';
 import {
   getSidePanelLiveSnapshot,
   subscribeSidePanelLiveSnapshot,
@@ -48,6 +48,7 @@ import {
   MAX_SIDE_PANEL_PANES,
   canSplitSidePanelPaneAtSize,
   collectSidePanelPanes,
+  isPluginSidePanelTool,
   getFocusedSidePanelPane,
   getSidePanelNodeMinimumPixels,
   getSidePanelSplitResizeBounds,
@@ -60,7 +61,10 @@ import {
   type SidePanelSplitNode,
 } from '../../domain/sidePanelLayout';
 import { terminalLayerSidePanelStableCtxEqual } from './terminalLayerViewMemo';
-import { SidePanelMountedContent } from './terminalLayerSidePanelSlots';
+import { PersistentSidePanelPortal, SidePanelMountedContent } from './terminalLayerSidePanelSlots';
+import { usePluginTerminalSidebar } from '../../application/state/usePluginTerminalSidebar';
+import { PluginTerminalSidebarPageHost } from '../plugins/PluginTerminalSidebar';
+import { PluginContributionIcon } from '../plugins/PluginContributionIcon';
 import { getPaneMagnificationShortcutLabel } from '../../domain/paneMagnification';
 
 const MemoizedSidePanelMountedContent = memo(
@@ -358,7 +362,7 @@ function SidePanelSplitView({
   );
 }
 
-function SidePanelLayoutTree({
+export function SidePanelLayoutTree({
   node,
   layout,
   paneCount,
@@ -568,6 +572,9 @@ function hasMountedSidePanelContent(ctx: SidePanelContext): boolean {
     && Array.from((sidePanelOpenTabs as Map<string, SidePanelTab>).values()).includes('history');
   const anyNotesOpen = sidePanelOpenTabs instanceof Map
     && Array.from((sidePanelOpenTabs as Map<string, SidePanelTab>).values()).includes('notes');
+  const anyPluginOpen = ctx.sidePanelLayouts instanceof Map
+    && [...(ctx.sidePanelLayouts as Map<string, SidePanelLayout>).values()]
+      .some((layout) => collectSidePanelPanes(layout.root).some((pane) => isPluginSidePanelTool(pane.tool)));
 
   return !(
     browserMountedTabIds.length === 0
@@ -579,10 +586,16 @@ function hasMountedSidePanelContent(ctx: SidePanelContext): boolean {
     && themeMountedTabIds.length === 0
     && !anyHistoryOpen
     && !anyNotesOpen
+    && !anyPluginOpen
   );
 }
 
 function TerminalLayerSidePanelSectionInner({ ctx }: { ctx: SidePanelContext }) {
+  const pluginSidebar = usePluginTerminalSidebar({ layouts: ctx.sidePanelLayouts ?? new Map(),
+    getSession: ctx.getActiveTerminalSessionId ?? (() => null),
+    isTerminalTab: (tabId) => (ctx.sessions ?? []).some((session: { id: string }) => session.id === tabId) || !!ctx.workspaceById?.has(tabId),
+    select: (tool) => ctx.handleSwitchSidePanelTab?.(tool),
+    withdraw: (tabId, paneId, tool) => ctx.handleWithdrawPluginSidebarPane?.(tabId, paneId, tool) });
   if (!hasMountedSidePanelContent(ctx)) {
     // Keep AI scope maintenance alive even with zero mounted tool panels so
     // merge/dissolve handoff still runs when the user closed AI before the
@@ -604,7 +617,7 @@ function TerminalLayerSidePanelSectionInner({ ctx }: { ctx: SidePanelContext })
       </AISidePanelStateRoot>
     );
   }
-  return <TerminalLayerSidePanelInner ctx={ctx} />;
+  return <TerminalLayerSidePanelInner ctx={ctx} pluginSidebar={pluginSidebar} />;
 }
 
 /** Skip chrome rebuilds when only live/workspace-focus ticks change. */
@@ -614,7 +627,7 @@ export const TerminalLayerSidePanelSection = memo(
 );
 TerminalLayerSidePanelSection.displayName = 'TerminalLayerSidePanelSection';
 
-function TerminalLayerSidePanelInner({ ctx }: { ctx: SidePanelContext }) {
+function TerminalLayerSidePanelInner({ ctx, pluginSidebar }: { ctx: SidePanelContext; pluginSidebar: ReturnType<typeof usePluginTerminalSidebar> }) {
   const activeTabId = useActiveTabId();
   const sidePanelOpenTabs = ctx.sidePanelOpenTabs as Map<string, SidePanelTab>;
   const sidePanelLayouts = ctx.sidePanelLayouts as Map<string, SidePanelLayout>;
@@ -630,6 +643,7 @@ function TerminalLayerSidePanelInner({ ctx }: { ctx: SidePanelContext }) {
     handleOpenAI,
     handleOpenHistory,
     handleOpenNotes,
+    handleSwitchSidePanelTab,
     handleOpenBrowser,
     handleOpenScripts,
     handleOpenSystem,
@@ -1046,6 +1060,9 @@ function TerminalLayerSidePanelInner({ ctx }: { ctx: SidePanelContext }) {
     { id: 'system' as const, label: t('terminal.layer.system'), icon: <Activity size={15} />, onClick: handleOpenSystem },
     { id: 'notes' as const, label: t('terminal.layer.notes'), icon: <NotebookText size={15} />, onClick: handleOpenNotes },
     { id: 'ai' as const, label: t('terminal.layer.aiChat'), icon: <MessageSquare size={15} />, onClick: handleOpenAI },
+    ...pluginSidebar.pages.map((page) => ({ id: page.tool, label: `${page.title} · ${page.pluginName}`,
+      icon: <PluginContributionIcon pluginId={page.pluginId} icon={page.icon} size={15} />,
+      onClick: () => handleSwitchSidePanelTab?.(page.tool) })),
   ], [
     handleOpenAI,
     handleOpenHistory,
@@ -1056,6 +1073,8 @@ function TerminalLayerSidePanelInner({ ctx }: { ctx: SidePanelContext }) {
     handleOpenTheme,
     handleToggleSftpFromBar,
     t,
+    handleSwitchSidePanelTab,
+    pluginSidebar.pages,
   ]);
   const sidePanelTabItemById = useMemo(
     () => new Map(sidePanelTabItems.map((item) => [item.id, item])),
@@ -1491,6 +1510,19 @@ function TerminalLayerSidePanelInner({ ctx }: { ctx: SidePanelContext }) {
             paneHosts={panePortalHosts}
             parkingHost={parkingHost}
           />
+          {activeTabId && pluginSidebar.sessionId && activeSidePanelPanes.map((pane) => {
+            const page = pluginSidebar.pages.find((item) => item.tool === pane.tool);
+            const target = panePortalHosts.get(pane.tool) ?? parkingHost;
+            if (!page || !target) return null;
+            const sessionId = pluginSidebar.sessionId!;
+            return <PersistentSidePanelPortal key={`${activeTabId}:${pane.id}:${sessionId}`} portalKey={`plugin-${pane.id}`} target={target}>
+              <PluginTerminalSidebarPageHost page={page} tabId={activeTabId} sessionId={sessionId}
+                focusOnReveal={activeSidePanelLayout?.focusedPaneId === pane.id}
+                adapter={pluginSidebar.contributions} getSession={ctx.getActiveTerminalSessionId}
+                unavailable={() => ctx.handleWithdrawPluginSidebarPane?.(activeTabId, pane.id, page.tool)}
+                focused={() => { if (activeTabStore.getActiveTabId() === activeTabId) ctx.handleFocusSidePanelPane?.(pane.id); }} />
+            </PersistentSidePanelPortal>;
+          })}
         </div>
       </div>
     </div>

components/terminalLayer/TerminalLayerTabBridge.test.ts

@@ -32,6 +32,13 @@ test('terminal layer bridge passes vault open callbacks into the side panel cont
   assert.match(source, /onOpenVaultSectionFromChat: s\.onOpenVaultSectionFromChat/);
 });
 
+test('production terminal layer context forwards extension sidebar owner and pane callbacks', () => {
+  const contextProjection = source.slice(source.indexOf('const ctx = useMemo('));
+  for (const callback of ['getActiveTerminalSessionId', 'handleSwitchSidePanelTab', 'handleWithdrawPluginSidebarPane']) {
+    assert.match(contextProjection, new RegExp(`${callback}: s\\.${callback}\\b`));
+  }
+});
+
 test('terminal layer bridge updates side panel live state after render', () => {
   assert.match(source, /const sidePanelLiveSnapshot = useMemo<SidePanelLiveSnapshot>/);
   assert.match(

components/terminalLayer/TerminalLayerTabBridge.tsx

@@ -489,6 +489,9 @@ export function TerminalLayerTabBridge({ stableRef }: { stableRef: StableRef })
     handleFontWeightResetForFocusedSession: themeState.handleFontWeightResetForFocusedSession,
     handleOpenAI: s.handleOpenAI,
     handleOpenNotes: s.handleOpenNotes,
+    getActiveTerminalSessionId: s.getActiveTerminalSessionId,
+    handleSwitchSidePanelTab: s.handleSwitchSidePanelTab,
+    handleWithdrawPluginSidebarPane: s.handleWithdrawPluginSidebarPane,
     handleOpenBrowser: s.handleOpenBrowser,
     handleOpenSystem: s.handleOpenSystem,
     handleOpenHistory: s.handleOpenHistory,

components/terminalLayer/TerminalLayerView.tsx

@@ -7,8 +7,9 @@ import { TerminalLayerWorkspaceSection } from './TerminalLayerWorkspaceSection';
 import { terminalLayerViewCtxEqual } from './terminalLayerViewMemo';
 import { useTerminalHostTreeLayoutWidth } from '../../application/state/terminalHostTreeStore';
 import { resolveTerminalLayerSurfaceStyle } from '../terminalPaneVisibility';
+import type { PluginSidebarHostActions } from '../../application/state/usePluginTerminalSidebar';
 
-type TerminalLayerViewContext = Record<string, any>;
+type TerminalLayerViewContext = Record<string, any> & PluginSidebarHostActions;
 
 function TerminalLayerViewInner({ ctx }: { ctx: TerminalLayerViewContext }) {
   const hostTreeLayoutWidth = useTerminalHostTreeLayoutWidth();

components/terminalLayer/terminalLayerSidePanelSlots.tsx

@@ -693,7 +693,7 @@ export function movePersistentPortalNode(
   }
 }
 
-function PersistentSidePanelPortal({
+export function PersistentSidePanelPortal({
   portalKey,
   target,
   children,

components/terminalLayer/terminalLayerViewMemo.ts

@@ -316,6 +316,9 @@ const SIDE_PANEL_STABLE_CTX_KEYS = [
   'handleOpenTheme',
   'handleOpenAI',
   'handleOpenNotes',
+  'getActiveTerminalSessionId',
+  'handleSwitchSidePanelTab',
+  'handleWithdrawPluginSidebarPane',
   'handleOpenBrowser',
   'handleBackFromNotes',
   'handleOpenHostFromNotes',

components/vault/VaultViewLayout.tsx

@@ -29,6 +29,7 @@ import { LazyLoadBoundary } from "../ui/lazy-load-boundary";
 import { toast } from "../ui/toast";
 import { AppWordmark } from "../AppWordmark";
 import { openHostBrowser } from "../../application/hostBrowser";
+import { PluginVaultNavigation, PluginVaultPage } from '../plugins/PluginVaultPages';
 
 type VaultViewLayoutContext = Record<string, any>;
 
@@ -156,6 +157,7 @@ export function VaultViewLayout({ ctx }: { ctx: VaultViewLayoutContext }) {
     ContextMenuTrigger,
     Copy,
     currentSection,
+    pluginVault,
     customGroups,
     deleteGroupPaths,
     deleteGroupWithHosts,
@@ -595,12 +597,13 @@ export function VaultViewLayout({ ctx }: { ctx: VaultViewLayoutContext }) {
           </div>
 
           <div
-            className={cn("space-y-1", sidebarCollapsed ? "px-1.5" : "px-2.5")}
+            className={cn("min-h-0 flex-1 overflow-y-auto space-y-1", sidebarCollapsed ? "px-1.5" : "px-2.5")}
           >
             <Tooltip>
               <TooltipTrigger asChild>
                 <RippleButton
                   variant={currentSection === "hosts" ? "secondary" : "ghost"}
+                  data-plugin-vault-fallback
                   className={cn(
                     "w-full h-10",
                     sidebarCollapsed
@@ -805,11 +808,12 @@ export function VaultViewLayout({ ctx }: { ctx: VaultViewLayoutContext }) {
                 </TooltipContent>
               )}
             </Tooltip>
+            {pluginVault && <PluginVaultNavigation model={pluginVault} collapsed={sidebarCollapsed} />}
           </div>
 
           <div
             className={cn(
-              "mt-auto pb-4 space-y-2",
+              "mt-auto shrink-0 pb-4 space-y-2",
               sidebarCollapsed ? "px-1.5" : "px-2.5",
             )}
           >
@@ -864,6 +868,7 @@ export function VaultViewLayout({ ctx }: { ctx: VaultViewLayoutContext }) {
             className="flex-1 min-w-0 flex flex-col min-h-0 relative"
             data-section="vault-main"
           >
+            {pluginVault?.selected && <PluginVaultPage key={pluginVault.selected.key} model={pluginVault} />}
             <VaultPageHeader
               className={cn(!isHostsSectionActive && "hidden")}
               dataSection="vault-hosts-header"

docs/plugin-platform/capability-coverage.md

@@ -0,0 +1,166 @@
+# Sandbox capability coverage
+
+This matrix tracks expansion from Draft #3951 at
+`e5bd294cddbf58dfe04c646b6291933d980498fd`. Each accepted item requires a
+canonical schema, generated SDK, broker, permission policy, quota and audit,
+host adapter, lifecycle cleanup, synthetic boundary tests, review, and exact-SHA
+CI. Enumeration in a manifest is not a working API. Status `planned` does not
+mean complete. Existing APIs remain available.
+
+## Coverage matrix
+
+| Subsystem | Working API at baseline | Enumeration or missing adapter | Accepted bounded entry | Data and action risk | Authorization resource | Revocation, audit, quota | Verification and disposition |
+| --- | --- | --- | --- | --- | --- | --- | --- |
+| Authorization management | Engine `listGrants`, `revokeAll`, database audit | Manager shows declarations only | Host-only grant list, bounded audit summary, disable and revoke | Paths, session IDs, grant metadata are sensitive | Exact plugin ID, trusted app sender | Serialized manager mutation, disable before revoke, runtime teardown, retained audit | Batch 1 limited acceptance complete on ff3734d: independent review fixes, host/manager/UI tests, exact test/packaging CI, parent native own-views Application grant/revoke/disable/runtime-stop check. Visible view was manually closed beforehand. No plugin RPC for managing grants |
+| Network and credential leases | `network.request`, `credentials.createLease`, single-use host redemption | SDK request omits lease and authorization fields | Canonical request types matching broker | Network mutation and credentials | Exact origin plus secret reference and operation | Existing timeout, redirects, byte quotas, runtime checks, lease TTL | Batch 1 contract/SDK consistency complete: canonical types, synthetic fixture/lease tests, feature discovery and exact CI. No live network or credential acceptance claimed. No plaintext secret API |
+| Commands, menus, toolbar, status bar, views | `commands.execute`, settings, context keys, view state and messages, UI contributions | No editor or SFTP menu slots | Existing contribution system | Plugin text and arguments may be sensitive | Namespaced contributions and permissions | Existing lifecycle, rate and message limits | Existing tests. New context menu slots planned with bounded context DTOs |
+| Terminal providers | Decorations, links, completion, snapshots through provider requests | Session change delivery follows prior provider request and non-once grant | Preserve providers. Standalone selected-session watch planned | Hostnames, session state, endpoint identity | Host-selected session, runtime identity | Session-close and revoke cleanup, bounded event rate | Existing provider tests. Ordinary views cannot independently subscribe today |
+| Current context and host picker | Host context keys are boolean state | `vault.metadata` enumeration is not generic SDK | Selected host/session DTO from an explicit whitelist | Labels and endpoint metadata are sensitive | Host-owned user-action context, selected host/session | TTL, runtime and session invalidation, redacted audit | Planned. Never reuse agent `sanitizeHostForAgent` as plugin DTO |
+| Terminal selection and input draft | Provider-supplied snapshots, completion suggestions | No explicit selection-share or draft API | User shares selection, plugin proposes a visible editable draft | Terminal plaintext, accidental execution | Host action token plus exact live session/endpoint | Single-use token, size cap, no plaintext audit, active identity before commit | Planned. Reject Enter/control characters for draft insertion. No full history or direct shell |
+| Native interactions and clipboard | Native permission dialogs; new browser SDK host choice/input and explicit copy/share workflow | Progress/toast remain unimplemented | Host-owned prompts, two-phase clipboard snapshot/share, exact copy preview | Clipboard and input may contain secrets; UI discloses granted network capability; prompt spam | `ui.interact`, clipboard direction, host-signed window/runtime/version/phase/TTL action | Admission before permission prompt, byte/rate/concurrency limits, lock/blur/close/revoke cleanup, active guard, content-free audit | [Host interaction slice](./host-interactions.md) implemented and synthetic-tested. 8e4dd0c exact test/packaging CI and independent delta review passed. Parent native compose and explicit Preview/Share/copy succeeded; a separately approved 0.1.1 compose ran about 86 seconds, beyond the old 30-second deadline and within the declared 180-second budget, with no fresh command-timeout error. All five permissions were Once; cleanup is parent-owned. New navigation slices retain separate acceptance gates. Progress/toast still planned. No background reads or trusted plugin `userGesture` boolean |
+| Local filesystem | Read file, stat, overwrite existing regular file | Directory listing lacks same-handle native adapter | Keep current boundary, evaluate file picker handles | Arbitrary local file content and writes | Canonical exact path or selected file handle | Inode checks, no symlink alias, bounded bytes, active runtime | Existing filesystem tests. Directory enumeration and new arbitrary-path creation deferred until portable safe native adapter exists |
+| SFTP and remote files | No generic plugin API | `sftp.read` and `sftp.write` enumerated only | Host-selected session/path/mode/TTL handles, read and explicit save/upload | Remote secrets and destructive overwrite | Live endpoint identity, exact path, read/write split | Cancel streams, byte quota, overwrite confirmation, close/revoke cleanup | Batch 2 planned. Never forward arbitrary MCP catalog or session ID alone |
+| Editor and Notes | No plugin document API | No versioned snapshot or edit preview | Explicit snapshot and versioned proposed edit | Document secrets, lost updates, executable files | Selected document plus revision and action token | Version conflict check, preview, bounded bytes, revocation | Planned evaluation after shared action context. No unattended edits |
+| Snippets and scripts | Provider import drafts only | No generic read/run API | Explicit selection and create draft | Script contents may contain secrets. Running executes commands | Selected item, read versus draft write | Preview, byte cap, no automatic execution | Planned evaluation. Script `run` and onConnect modification deferred |
+| Connections and authentication | Connection/authentication providers, opaque credentials, streams | Generic host open/connect absent | Existing providers remain | Connect can execute saved onConnect scripts | Provider operation plus live endpoint and credential lease | Existing provider lifecycle, streams and quotas | Existing tests. Generic connect is a write/execution capability, deferred pending explicit execution design |
+| Sync and storage | Local namespaced KV, encrypted-object sync providers, opt-in setting sidecars | No general KV cloud sync | Existing opt-in provider protocol | Conflicts, deletes, credential access | Provider/account/object, settings scope | Existing limits and lifecycle, non-cascade metadata | Existing sync tests. General KV sync deferred until conflict/delete/quota/migration policy is defined |
+| Vault and keychain | Credential references and import preview/commit | Metadata/write enums do not grant a generic Vault SDK | Only user-selected whitelist DTOs and drafts | Notes, environmentVariables, startupCommand, keys and credentials | Selected object plus field/direction | Explicit preview, identity checks, redacted audit | Full Vault export and secret reads deferred indefinitely. No agent field-exclusion DTO reuse |
+| System manager and Docker | No plugin system API | Agent/MCP adapters are separate authority | Typed read-only summaries excluding args/env/inspect | Process command lines and Docker inspect can expose secrets | Selected live session and summary kind | Bounded result, endpoint identity, cancellation | Planned evaluation. Arbitrary process/inspect forwarding deferred |
+| Port forwarding | No generic plugin API | Existing agent start is write-sensitive | Selected rule status and open host form | Rule endpoints and local exposure | Selected rule plus host action | Bounded DTO, session close and revoke | Planned evaluation. Direct start deferred until binding/listener approval design |
+| Themes, settings, appearance, i18n | Terminal theme/background Providers, isolated view CSS, scoped settings and environment updates | No host global theme contribution. Personal customCSS is not plugin authority | Accepted ThemePack stage: static palette registry, selector, local preview, revision-safe apply/cancel/reset, terminal linkage | Unreadable palettes and misleading security UI. Nineteen UiThemeTokens fields are not independent: accent derives primary/ring/foregrounds | User explicitly selects a theme; static contribution enablement separate from code permissions | Immutable version/hash, bounded JSON, contrast/security-surface gates, preview owner/revision and safe fallback | First host color layer implemented; [contract/lifecycle/evidence](./theme-packs.md). Exact-SHA CI, independent review and native acceptance pending. Static terminal linkage not yet accepted; no arbitrary DOM/CSS, remote assets, layout replacement or security UI customization |
+| Transfer center | Host transfer queue exists, no plugin entry | No ownership-bound task API | Observe and cancel only plugin-created tasks | Paths and host endpoints reveal user data. Cancel may leave partial files | Own transfer handle plus source/destination authority | Shared backpressure, cancel/close cleanup, honest partial status | Planned with batch 2. Do not broadcast or cancel other tasks |
+| AI, MCP, automation | Host agent catalog and harness exist separately | No generic plugin AI or tool forwarding | Selection-to-proposal workflow through the same controlled primitives | Content disclosure, account authority and model cost | Explicit content sharing plus service origin/budget | No inherited history, tools, account, or hidden cron | Controlled workflow planned. Generic host AI and visible schedules deferred to distinct product decision |
+| Known hosts, app lock and global security | Host security management UI | No plugin management API | Future allowlisted security-page navigation | Host-key trust, unlock, keys and security policy affect all sessions | Host navigation action only | No mutation or sensitive DTO | Security policy mutation, private-key reads, auto-trust and unlocking deferred indefinitely |
+| Plugin blob/cache | Local KV exists | No exclusive blob cache | Evaluate bounded plugin-owned cache when a real workflow needs it | Disk growth and lifecycle ambiguity | Plugin namespace, no arbitrary path | Size quota, eviction and uninstall policy required | Deferred until a concrete larger-than-KV workflow establishes value and retention policy |
+| Vault and terminal navigation | `tab` mounts a sandbox page through TopTabs/QuickSwitcher; aside/panel are overlays | No Vault subpage registry or terminal side-panel plugin tool. `settings` is a detail entry, not a new settings category | Accepted independent slice: host-owned namespaced Vault pages in an Extensions group, mounted in the Vault content area through existing ViewHost; then terminal pane/split pages for the selected session | Navigation cannot disclose session contents or replace built-in/security navigation | Declared page contribution plus host selection. Content reads have independent permissions | Host order/when/focus, cancellation of late open, view cleanup on hide/update/disable/uninstall, safe invalid-link fallback | [Vault page slice](./vault-pages.md) implemented and synthetic-tested: actual Vault content slot, private Scratchpad, catalog withdrawal, host occlusion, reserved-open cancellation, owner/crash/lock cleanup. Exact CI/independent/native acceptance pending. [Terminal sidebar slice](./terminal-sidebar.md) also implemented with actual pane/split mounting, owner focus and session-change cleanup; no automatic session data. Exact CI/independent/native acceptance pending for the new stack. No arbitrary router/DOM API |
+| Distribution and runtimes | Browser-only public catalog, immutable packages, advanced developer gate | Signing/trust and release remain separate phase | Retain existing boundary | Package execution and publisher trust | Pinned catalog selection, hash, engine/features | Existing install transaction, quarantine and cleanup | No merge/release. Do not extend to arbitrary Node, IPC, shell, or global capabilities |
+
+## Delivery order and stopping rule
+
+1. Batch 1: actual authorization management plus network contract consistency.
+   Keep the existing manager layout. Add one independent permission panel.
+2. Batch 1b: the host text interaction slice, then selected context and terminal
+   sharing/drafts. A plugin-supplied gesture is never authority.
+3. A separate navigation slice mounts actual Vault extension pages, then terminal
+   sidebar panes, reusing the isolated ViewHost and keeping content permissions separate.
+4. Deliver the declarative ThemePack stage with security appearance and contrast gates.
+5. Batch 2: SFTP selected-file handles and explicit transfer destinations.
+6. Reassess editor, Notes, snippets, menus, system summaries, and port forwarding
+   using the tested host-action and resource primitives.
+
+Stop only when every row is implemented and tested, reasonably deferred with a
+specific boundary and rationale, or awaiting a concrete user decision. A
+planned row remains unfinished. Native screenshots and recordings belong to
+the parent thread. Real credentials, hosts, or transfers require approval for a
+specific target there. Synthetic checks do not establish native acceptance.
+
+## Batch 1 evidence and next workflow
+
+The independent permission panel adds only an import and a detail mount to
+`components/settings/tabs/PluginPackageManager.tsx`. It uses the manager hook's
+new `refresh()` after host revocation. Marketplace layout remains owned by the
+parallel UI layer. Five locale files contain the panel strings.
+
+The next usable workflow is a browser plugin that asks a host quick-pick/input
+question, then explicitly copies its result or asks the user to share clipboard
+text. The host displays the plugin source and action before reading or writing.
+A canonical `HostInteractionRequest` and bounded result carry only text/choice
+IDs. The host owns request IDs, requester webContents, runtime/version, TTL,
+cancellation, and the consent result. The renderer cannot reply for another
+window. Plugin `userGesture` values are ignored. Runtime/revoke shutdown aborts
+all outstanding prompts and ignores late replies. A shared prompt primitive
+then supports selected host/session context, selection share, and input drafts.
+
+Before proceeding to the sensitive context/terminal and SFTP entries, the
+native path must prove consent, cancellation, quota, and identity binding with
+synthetic data. UI screenshots and real-resource approval remain parent-owned.
+
+Baseline code references: `electron/plugins/hostService.cjs`,
+`secureCapabilities.cjs`, `permissionEngine.cjs`, `terminalProviderService.cjs`,
+`filesystemBroker.cjs`, `extensionProviderService.cjs`,
+`packages/plugin-sdk/src/index.ts`, and
+`packages/plugin-contract/schema/plugin-contract.schema.json`. Host business
+implementations under `electron/capabilities/catalog/` are reference material,
+not plugin authority. `infrastructure/ai/vaultAgentBridgeClient.ts` is not a
+plugin DTO sanitizer.
+
+## Navigation slice checkpoint
+
+The Vault stage adds `views.vault-pages`, the `vault-page` location, and the
+existing `views` permission. It grants no Vault/session data. The ordinary
+browser Scratchpad example uses only its own bounded view-state API and
+explicit user input. It is not a Notes API or automatic sync feature.
+
+The independent integration base includes #3956 UI polish and #3960 d4ca fixes;
+frozen evidence heads and prior PR bases are unchanged. Related UI changes in
+this stage are limited to VaultView/VaultViewLayout, new independent plugin
+components/hooks, and localized strings. PluginMarketplace/PluginPackageManager
+layouts are not rewritten. Native acceptance belongs to the parent with a new
+fixture-specific own-views approval. Sidebar, ThemePack, selected context and
+SFTP remain unfinished; this checkpoint is not overall completion.
+
+## Terminal sidebar checkpoint
+
+`views.terminal-sidebar` exposes one more existing sandbox view placement,
+using only the existing own-views permission. The host owns navigation,
+selection, split/close and focus. Its context is a surface string only; no
+terminal DTO or resource authority is implied. The Session Scratchpad fixture
+uses explicitly typed synthetic text and its own view state.
+
+This stage builds on ordinary merges containing #3960 8e4dd0c and the #3971
+stale-layout callback fix. Prior QA heads and PR bases are not rewritten. The
+ThemePack implementation, selected-context/drafts and file handles remain
+unfinished; parent review/native gates still apply to each delivered head.
+
+## Color-pack and remaining workflow checkpoint
+
+The first [ThemePack color layer](./theme-packs.md) now has an implemented host
+catalog, data-only admission, Appearance selector, local preview, revision-safe
+application/reset, missing-version fallback and host security palette boundary.
+It is not native-accepted until the new exact head is independently reviewed,
+built by CI and exercised through normal Settings. Terminal palette linkage is
+not accepted by this contract yet, so a declared but ignored linkage cannot be
+counted as coverage. Font/density/icon/background packs remain separate product
+and accessibility decisions, rather than arbitrary CSS permissions.
+
+Parent native evidence for sidebar `a8adeb86` now covers the original Local
+Terminal blocker, own-views Once, save, magnify/restore, a split with empty Notes,
+and side/bottom docking. `733f44c` adds only the production bridge projection
+regression. The older `0c097a1` CI run `40308057623` remains **failed and
+unattributed**: 9447 top-level TAP results are `ok`, the aggregate footer is
+missing and the process exits 1. A newer passing run does not change that record.
+The native Vault success retains its original `0c097a1` evidence label.
+
+The next implementation stages are bounded by useful workflows:
+
+1. **Selected terminal sharing and drafts (A).** Reuse host-signed action
+   contexts for an explicit selection preview/share, then let the plugin submit
+   a bounded input draft to the host compose surface. No Enter, raw PTY, history
+   enumeration or background terminal listener. First add a host-selected
+   session handle with a minimal from-scratch DTO and independent lifecycle
+   watch; navigation alone grants no content. Bind handles to actual session and
+   connection identity, runtime/version, owner, mode and TTL. Cover cancel,
+   reconnect, close, revoke and late draft results with synthetic terminals.
+2. **Selected file conversion/transfer (A).** The host picker issues read or
+   explicit-destination write handles. Start with one file, stat/read and saveAs
+   or upload, not recursive traversal or arbitrary paths. Require destination
+   preview/overwrite confirmation, byte/concurrency limits, cancellation,
+   session/endpoint identity and final active checks. Observe/cancel only the
+   plugin's own transfer. Real native SFTP targets require parent-coordinated
+   concrete approval; local tests use isolated fixtures.
+3. **Versioned document proposals (selected B).** Reuse snapshot/handle and host
+   review primitives for one explicitly shared editor document or Note. Apply
+   only an expected-version patch to its buffer after a visible diff; saving a
+   remote file remains a separate file operation. Reuse the draft path for a
+   selected snippet or new snippet template; do not run scripts or add onConnect
+   bindings. Cover edits after snapshot, detached ownership, closure and revoke.
+4. **Final reassessment.** Recheck the matrix by actual workflow and eight gates.
+   Read-only system aggregates, selected port-rule status and bounded navigation
+   may be added only where the shared primitives leave a concrete useful gap.
+   Full process arguments/env/inspect, tunnel start, arbitrary AI/MCP tools,
+   background jobs, general KV sync and raw high-privilege access remain deferred
+   or retained boundaries. Do not invent new C work to prolong the task.
+
+These stages remain unfinished work, not API-name coverage. Exact schemas and
+ordering will follow the existing brokers/adapters rather than a parallel RPC
+stack or one namespace per product module.

docs/plugin-platform/community-catalog.md

@@ -0,0 +1,106 @@
+# Curated plugin catalog
+
+The catalog lives in `electron/plugins/catalog.json` in this repository. There
+is no new marketplace account service or external directory repository. It is
+shipped with the app; catalog changes become available with an app update.
+Normal Settings exposes browser-only management and catalog browsing. Advanced
+local packages require `NETCATTY_PLUGIN_DEV=1`; that flag never grants permissions.
+Native acceptance and security/distribution review remain required before merge.
+
+## Submit or update a plugin
+
+Open a PR changing one entry. Provide:
+
+- Stable reverse-domain plugin ID, author, name and short description.
+- Public GitHub source repository and explicit license matching the package.
+- Exact version, full 40-character source commit and relative README `.md` path.
+- The complete validated manifest: engine/API ranges, required/optional permissions,
+  bounded resources, features and data/sync declarations must match package bytes.
+- Optional published artifact URL and SHA-256. No artifact means a source-only
+  example: the UI does not offer installation. Do not invent an artifact URL.
+- A concise change log, permission diff, supported OS test results, and synthetic
+  reproduction instructions. Current public runtime eligibility is browser-only
+  on the host platforms; native/platform-specific companions are excluded.
+
+Use the local CLI from the repository root:
+
+```sh
+npm ci
+npm run build:plugin-packages
+node packages/plugin-cli/dist/cli.js validate examples/plugins/hello-netcatty
+node packages/plugin-cli/dist/cli.js pack examples/plugins/hello-netcatty --out /tmp/hello-netcatty.ncpkg
+node packages/plugin-cli/dist/cli.js validate /tmp/hello-netcatty.ncpkg
+```
+
+The catalog contains first-party source examples: Plugin Starter for minimal
+settings/command use, and Hello Netcatty for terminal provider demonstrations.
+No downloadable release is fabricated or published by this change. A maintainer
+must verify real artifact provenance before adding the artifact object.
+
+## Enforced install boundary
+
+The renderer sends only a catalog ID. The main process selects the shipped
+entry, downloads over HTTPS from approved GitHub hosts with bounded size/time
+and redirects, checks SHA-256, and hands a private file to the same serialized
+PluginManager and PackageStore used for local imports. The immutable staged
+snapshot is hashed again before any version switch. Its exact ID/version,
+license and full manifest must match the catalog. Unknown permissions fail
+canonical schema validation. Browser-only eligibility rejects Node entrypoints,
+companions, raw terminal interceptors and advanced runtime declarations.
+
+The directory is a curated integrity assertion, not a publisher signature.
+Unsigned runtime grants remain bound to package digest. No latest fallback and
+no background code updates exist. Installing an update stops the old version;
+the new version remains disabled until reviewed and explicitly enabled. Required
+permissions are mediated again by the existing runtime permission engine.
+Local advanced development packages require the developer flag and use the existing permission model;
+this does not grant advanced privileges or make Node a sandbox.
+
+README is fetched only from the selected commit, on opening details. Redirects
+are refused and responses are limited to 256 KiB. Rendering constructs a small
+allowlist of React elements from Markdown; HTML remains escaped text and images
+are not fetched. Only explicit HTTPS links can be opened. README content is
+untrusted author documentation; permissions come from the manifest.
+
+## Review and maintenance
+
+CI now runs canonical plugin contract drift checks and the runtime suite,
+including catalog validation and install-boundary regression tests.
+Run `node --test electron/plugins/catalogService.test.cjs` and the plugin
+contract/runtime tests for every entry change. Review actual package/source
+provenance and permission/resource differences manually on first submission and
+sensitive updates. Packaging validation includes traversal/integrity checks but
+is not a malware audit. Human review is mandatory before adding an artifact;
+there is no automated acceptance bot in this slice.
+
+Authors maintain their plugins, document data handling and respond to security
+reports. Maintainers may remove entries or decline updates. Directory checks
+are limited checks, not a safety certification, legal waiver or a promise to
+repair third-party plugins. No third-party terms are copied here.
+
+## Data and lifecycle
+
+Local KV is per-plugin and does not sync. Only explicitly syncable non-secret
+settings enter encrypted sidecars; machine paths, grants, packages, runtime
+state and secrets do not become cloud authority. Existing sidecar conflict and
+account isolation mechanisms are reused. A generic KV sync API remains a separate
+schema/migration decision.
+
+Incompatible host/API/features disable plugins before lazy contributions are
+published, retain package/data and record a reason. A compatible downgrade never
+automatically re-enables them. Disable stops runtime and contributions; uninstall
+removes package code and local KV, while user-owned settings/secrets/sidecars
+remain. Existing crash quarantine and generation-bound cancellation apply.
+
+Missing OS-backed key storage blocks secrets/credentials, without blocking
+catalog browsing or non-secret plugins. The Settings manager reports this state;
+never switch to plaintext storage or disable Chromium sandboxing for a demo.
+
+## When permission prompts appear
+
+Enabled is an availability switch, not a security review or a grant. A lazy
+plugin can become enabled without starting code. Its first command/provider use
+starts the runtime; required permissions are authorized at that activation
+boundary. Optional permissions are requested when a broker operation needs them.
+Missing/denied decisions fail closed. Never interpret an Enabled badge as proof
+that terminal, credential, network or filesystem access has been approved.

docs/plugin-platform/contract-and-sdk.md

@@ -1,6 +1,6 @@
 # Netcatty plugin contract and SDK
 
-Status: internal preview (`0.1.0-internal`)
+Status: internal preview (`0.1.0-internal.1`; legacy `0.1.0-internal` remains offered)
 Tracking issue: [#2269](https://github.com/binaricat/Netcatty/issues/2269)
 
 Phases 2 and 3 consume this contract in the isolated host runtime and secure
@@ -615,3 +615,28 @@ npm run build:plugin-packages
 
 The complete application checks remain mandatory because workspace and root
 dependency changes affect installation and release builds.
+
+
+## Plugin brand icons (internal revision 0.1.0-internal.1)
+
+Optional top-level `icon` reuses `IconReference` from contributions. A package
+using it must require `metadata.brand-icon` and an API range accepting
+`0.1.0-internal.1` but excluding `0.1.0-internal`. See
+[the author guide](plugin-icons.md) for bounds and packaging commands.
+
+The host still offers the previous wire revision to plugins with no top-level
+icon whose range matches only that revision. Compatibility selection returns the
+negotiated API version and runtime initialization uses and verifies that exact
+version. Host version bounds remain independently enforced; unknown required
+features still fail closed. No old manifest is rewritten and no permission grant
+is migrated by this revision.
+
+## Declarative host color contributions
+
+`appearance.theme-packs` adds `contributes.themes` and generated palette/reference
+schemas. A pure package uses `main: { "data": "theme" }`, contributes only themes
+and omits permissions/activation/companions. It has no executable runtime. Normal
+admission accepts this data-only form alongside browser-only code packages; Node
+and arbitrary IPC remain advanced/unsupported public boundaries. Selection is a
+trusted host Appearance action, not an SDK setter or `appearance.write` grant.
+See [Theme packs](./theme-packs.md) for limits, preview, persistence and fallback.

docs/plugin-platform/host-interactions.md

@@ -0,0 +1,130 @@
+# Host text interactions
+
+Status: internal preview. This layer builds on the grant management in Draft
+#3955. It adds `host.interactions` feature discovery, a generated request/result
+contract, and an ordinary browser SDK workflow. Native acceptance remains a
+separate parent-owned gate.
+
+## SDK and authorization
+
+| SDK call | Permission | Result |
+| --- | --- | --- |
+| `ui.quickPick(title, items)` | `ui.interact` | Approved item ID or `undefined` on cancel |
+| `ui.input(title, initialValue?)` | `ui.interact` | Approved single-line text or `undefined` on cancel |
+| `clipboard.readText(title)` | `clipboard.read` | Explicitly shared snapshot or `undefined` on cancel |
+| `clipboard.writeText(text, title)` | `clipboard.write` | `true` after copy, `false` on cancel |
+
+`ui.input` rejects CR and LF in initial values before any dialog is displayed,
+and rejects line breaks on submission. It does not silently remove hidden
+newlines. The displayed single-line value is the value submitted to the plugin.
+Clipboard text continues to support multiple lines.
+
+All calls use the canonical `ui.interact` RPC. No host DOM, native object,
+router, general command ID, or arbitrary IPC channel enters the SDK. Existing
+API versions remain offered. A plugin requiring the new workflow declares
+`features.required: ["host.interactions"]`; old hosts reject unsupported
+required features. Old plugins keep their existing APIs and permissions.
+
+Clipboard prompts restrict new permission decisions to once. Required or
+previously saved grants never skip the host action confirmation. Input and
+choice dialogs need their own declaration; a `views` or `menus` declaration is
+not permission to open them. Direction-specific clipboard permissions remain
+separate. The normal sample uses no network, host/session, filesystem, secret,
+Node, or shell capability.
+
+## User action and text sharing
+
+The host always displays plugin ID/version and a fixed source heading. Titles,
+choices, and text render as plain text. No plugin-supplied `userGesture` flag is
+accepted. The host creates an HMAC action token bound to request ID, runtime,
+plugin version, owner window, action kind, phase, nonce, and expiry. It sends
+that token only to the trusted host renderer. A response must come from the
+same WebContents and present the current token. Tokens are consumed before the
+first asynchronous action guard, so old-phase and duplicate responses cannot
+commit an action.
+
+Clipboard reading has two steps. **Preview clipboard** authorizes a host read
+into a bounded in-memory snapshot. The plugin receives nothing yet. **Share
+with plugin** sends exactly that snapshot after another active-identity check.
+Changes to the system clipboard after preview do not replace it. Cancel, lock,
+window loss, or revoke discards the snapshot. Copy shows the exact replacement
+text and requires its own confirmation before a native write.
+
+Shared text can be sensitive. The host explains that it becomes available to
+the plugin and its granted capabilities, including network access. Reading
+text does not approve a new network destination. This UI does not claim to
+prevent a plugin from transmitting derived text through an already granted
+capability. The example avoids network permission entirely.
+
+## Availability, limits, and cleanup
+
+The first slice supports the focused, visible, unlocked main window only.
+The host renderer registers readiness before any prompt can be presented.
+Other or unready windows return unavailable instead of inheriting an owner's
+authority. One interaction occupies an owner window at a time; there is no
+hidden prompt queue.
+
+`HostInteractionLimits` is the shared canonical source for 4,096 UTF-8 text
+bytes, 100 choices, 64 KiB serialized requests, one pending request per runtime,
+eight total, ten attempts per minute per runtime, and a 60-second lifetime.
+The current main-window-only adapter is narrower than the total pending bound.
+Admission runs before the permission prompt. The generic capability quotas and
+byte windows still apply. Text exceeding its cap is rejected without silent
+truncation. RPC uses the same generated deadline.
+
+After a native permission decision, an originally foreground request can wait
+at most one second for the same owner to regain focus. The host never focuses
+the window itself, presents content in the background, or postpones admission
+for an originally background request. Hide, lock, revoke, runtime stop, owner
+replacement and reload invalidate this admission, even during the permission
+dialog. Runtime activity and foreground state are checked again after waiting.
+
+Input cancellation, timeout, disable/update/crash/revoke, owner blur/hide/close,
+main-document reload, renderer exit, and app lock invalidate pending tokens.
+Same-document or subframe navigation does not permanently unregister a live
+host UI. Runtime teardown clears rate accounting. The broker checks runtime
+activity, owner readiness/focus, and app lock again immediately before native
+read/write or disclosure. A revoked operation cannot resume from a late reply.
+
+Commands normally retain the existing 30-second RPC deadline. A command that
+declares `interactive: true` must require `commands.interactive`; the host gives
+only that command a fixed 180-second total budget. This is not a global timeout
+increase or a UI/clipboard permission. Each individual host interaction still
+has its own 60-second deadline, including permission approval time.
+
+When an outer command fails, times out or is cancelled, the host cancels pending
+interactions and pre-prompt admissions for its captured runtime. On successful
+completion it closes orphan interactions once the last concurrent command ends.
+This cleanup does not reset rate/byte quotas and cannot affect a replacement
+runtime. A failure conservatively closes that runtime's single shared pending
+dialog even if another command is active. Late action tokens cannot commit a
+clipboard effect. Cancellation does not forcibly terminate arbitrary plugin
+JavaScript; ignored errors remain subject to permission, focus, rate and runtime
+limits. Do not start independent interactive workflows concurrently.
+
+Audit records contain only fixed event/action/kind fields. They contain no
+prompt, choices, user text, clipboard bytes, action tokens, or hashes derived
+from those values. A failed consent-audit write prevents the native action;
+no successful operation is reported for that failure.
+
+## Verification and native acceptance
+
+The [browser fixture](../../examples/plugins/host-interactions/README.md)
+exercises choice, input, copy, and clipboard transformation without a plugin
+view. Tests cover the actual runtime/SDK RPC path through permission middleware,
+actual host React dialog events against service-signed actions, denial, cancel,
+quota before prompt, overlong text, duplicate/forged actions, wrong owners,
+stale runtime, revoke during an asynchronous guard, audit failure, deadline,
+lock, blur, document navigation, and renderer teardown.
+
+Parent native acceptance uses a separately approved temporary example-plugin
+session and synthetic clipboard text. It needs no real hosts, credentials,
+network destination, shell, or persistent grant. Check both complete workflows,
+cancel before reading, cancel after preview, cancel copy, and disable/revoke
+with a pending dialog. Record the exact SHA and restore the test clipboard.
+Unit tests are not evidence of native Electron acceptance.
+
+Progress/toast, selected context and terminal sharing/drafts remain later slices.
+Navigation uses the existing sandbox ViewHost and adds no content permission.
+ThemePack and SFTP remain separate stages. This layer alone does not finish the
+capability coverage matrix.

docs/plugin-platform/isolated-runtime.md

@@ -300,3 +300,8 @@ installs plugins but fails to start them outside the repository checkout.
 separate `npm run test:plugin-runtime:electron` smoke launches both a real
 sandboxed BrowserWindow plugin and a real utilityProcess plugin, verifies
 bidirectional storage RPC, and checks the recorded runtime ownership.
+
+Static `appearance.theme-packs` packages are an explicit non-executable admission
+form: `main.data = "theme"`, theme-only contributions and no permissions,
+activation events or companions. The runtime supervisor never starts them. This
+exception does not admit Node code or arbitrary host access in normal Settings.

docs/plugin-platform/native-acceptance.md

@@ -0,0 +1,47 @@
+# Native Electron handoff
+
+Repository: binaricat/Netcatty. Frozen baseline: 0256e7471d66bbbca077c361ef379d7b11ce8465.
+Stack: feat/plugin-compatibility-review -> feat/plugin-settings-manager -> feat/plugin-curated-catalog.
+Use the final catalog branch for all three slices. Do not merge or release.
+
+1. Check out the branch on the approved desktop. Run npm ci and npm run build.
+2. Build the first-party sample:
+   npm run build:plugin-packages
+   node packages/plugin-cli/dist/cli.js pack examples/plugins/starter-netcatty --out /tmp/starter-netcatty.ncpkg
+   node packages/plugin-cli/dist/cli.js validate /tmp/starter-netcatty.ncpkg
+3. Launch the actual Electron binary without NETCATTY_PLUGIN_DEV and with a new disposable
+   --user-data-dir path, keeping Chromium sandbox enabled. Use the desktop's working
+   display and safe configuration; never --no-sandbox or real profiles/accounts.
+4. Settings > Plugins: record Community plugins list and Plugin Starter details.
+   Open README: actual pinned first-party GitHub retrieval; HTML inert, no remote images.
+   It intentionally says source-only: no downloadable artifact/release was invented.
+5. Import /tmp/starter-netcatty.ncpkg. It must remain disabled. Expand the installed
+   item: manifest permissions/resources, sensitive markers, Netcatty/API ranges,
+   SHA-256. Enable allows lazy activation; it does not grant permissions.
+   First command/view use prompts before runtime creation. Denying must not run code.
+6. With approved non-advanced permissions for the first-party example, edit Greeting
+   and open Starter: Greeting Panel (入门：问候面板) in the command palette.
+   Click Show greeting (显示问候语) and record the preference rendered in the panel.
+   No real host, cloud account, terminal credentials, runtime.advanced or third-party code.
+   Use Starter 0.1.1 or later. Its menus/views permissions support only the declared
+   command and sandboxed panel; do not expect terminal output.
+7. Disable, re-enable, close/restart the app with the same synthetic profile. Confirm
+   settings persist. Re-import same .ncpkg and verify it stops and stays disabled.
+8. Uninstall only the synthetic plugin using the two-step confirmation. Code/local KV
+   are removed; user-owned settings/secrets/sync sidecars have documented retention.
+9. On machines without a usable OS vault, the manager shows a downgrade notice;
+   secrets remain blocked but browsing and non-secret examples work.
+
+Compatibility upgrade/downgrade, required-feature changes, integrity mismatch,
+manifest mismatch, Node rejection, cleanup and traversal have automated synthetic
+coverage. Do not claim the above native steps were executed on this executor.
+
+This executor's native launch failed at Chromium's SUID sandbox configuration:
+chrome-sandbox is not root-owned mode 4755. No sandbox weakening was attempted.
+Native video is pending on the parent task's working desktop.
+
+10. Use the same AI-settings-style subpages: Installed and Community. Search by
+    name/author/description, open details and return. Verify README error/retry UI
+    if network is unavailable; do not bypass the network restriction.
+11. Inspect human-readable permission name, effect, scope, required/optional and
+    risk. Enabled means eligible for lazy activation, not permissions granted.

docs/plugin-platform/plugin-icons-proposal.md

@@ -0,0 +1,54 @@
+# Plugin manager window and brand icons
+
+Status: historical design investigation. The manager dialog and the accepted brand-icon design are now implemented. See [the current author guide](plugin-icons.md) for the shipped contract and bounds. The sections below preserve the original investigation and recommendations.
+
+## Manager window
+
+Settings > Plugins keeps an explicit Open plugin manager entry. The existing Radix Dialog opens a modal in the current renderer, up to 1180px wide and 88dvh high. Installed and Community, local import, manifest permissions and README remain inside it. Closing releases the mounted manager hooks; reopening starts at Installed. Detail Back stays inside the manager and preserves the Community search. Escape closes the manager and restores focus to its trigger.
+
+This uses the existing theme, dialog focus handling, plugin host and trusted bridge. A separate Electron BrowserWindow would require another renderer lifecycle, preload/context provisioning and trusted-sender review without providing a needed capability here. No window IPC, plugin runtime or grants are added.
+
+## Existing icon support
+
+- `packages/plugin-contract/schema/plugin-contract.schema.json`: `IconReference` is either a host-owned theme icon or a package icon with `light` and optional `dark` paths. It exists on commands, menus and views. `PluginManifest` has no top-level icon and rejects unknown properties.
+- `packages/plugin-cli/src/manifest.ts` validates contribution icon paths. `archive.ts` checks the declared resources during packaging and archive inspection. Missing files and unsafe paths are rejected.
+- `electron/plugins/contributionIconService.cjs` checks declaration ownership and current installed version before and after loading. It requires enabled/non-quarantined status, but does not require a running runtime. It reads a verified package root through `pluginProtocol.cjs` containment/realpath checks. Current input/output limits are 512 KiB, source edge 4096px, 16 megapixels, output edge 64px. Formats include PNG/WebP and SVG, JPEG, GIF, ICO.
+- `contributionIconRasterizer.cjs` decodes in a disposable sandboxed, network-denied BrowserWindow and returns bounded PNG data. Its SVG inspection is not a general SVG sanitizer; isolation/CSP/rasterization remain essential.
+- `application/state/usePluginContributionIcon.ts` discards stale requests. `components/plugins/PluginContributionIcon.tsx` selects light/dark images or a Puzzle fallback.
+- `PluginMarketplace.tsx` currently uses the host Package glyph. The catalog has no separately verified logo asset. Installed/detail surfaces do not expose a plugin brand logo.
+
+An author can already add a contribution icon (inside a command/menu/view):
+
+```json
+"icon": { "kind": "package", "light": "assets/action.png", "dark": "assets/action-dark.png" }
+```
+
+Include both files in the package and run CLI validate/pack. This changes that contribution's icon, not its market listing logo.
+
+## Proposed minimal brand-icon contract
+
+Reuse `IconReference`, adding an **optional** `PluginManifest.icon`; do not invent a URL/logo string format. A package brand icon would look like this after support ships:
+
+```json
+"icon": {
+  "kind": "package",
+  "light": "assets/logo.png",
+  "dark": "assets/logo-dark.webp"
+}
+```
+
+Recommended first version:
+
+- Static PNG or WebP, transparent background if desired; recommend a square 128–256px image. Enforce 256 KiB per source and a 512px maximum edge, validate MIME/signature and decoded dimensions, reject animated input, output bounded raster PNG. A single `light` asset works in both themes; `dark` is optional. Host theme icons can reuse the existing allowlist without package I/O.
+- Relative package paths only: no URL, absolute/drive/UNC paths, traversal, backslash, NUL, symlink escape or archive special entries. Do not read arbitrary renderer-supplied paths. Verify exact package hash/version and declaration on each uncached resolution; key caches by package identity/hash/theme, and discard stale results on update/uninstall.
+- Old plugins omit the field and continue to work with one shared host fallback. Per `contract-and-sdk.md`, adding this optional field requires an API/schema revision. New packages using it must declare the matching API range and required feature, plus a minimum host version that understands it: older strict schemas will reject an unknown field. Do not promise new-manifest compatibility with older hosts.
+- Extend the single contract and regenerate its consumers. Extend CLI path enumeration and both pack/archive checks; enforce image bounds during validation/import, not only in the UI. Reuse contained-file reads and the bounded rasterizer instead of adding file:// or runtime resource access in the application renderer.
+- Separate brand-image availability from contribution availability. Verified installed packages may show a logo while disabled without enabling or activating code. Do not loosen the existing contribution-icon enabled gate globally. Share the decoding implementation through a narrow brand-image operation that resolves the active installed declaration itself.
+- For uninstalled market entries, do not execute or install a plugin to obtain its logo. Use a small, catalog-reviewed static asset bundled with Netcatty, with its source commit and digest bound to that catalog version; absent assets use the same fallback. In particular the two current source-only examples have no downloadable artifact to extract. A later remote asset transport would need its own bounded allowlist/hash/redirect/cache policy and is outside this first proposal.
+- Use one brand-icon component in catalog cards, catalog details and installed lists/details. On decode/read failure keep the fallback and metadata/actions usable; do not fall back to a remote URL. Icons are decorative, with plugin names remaining accessible text.
+
+Do not add brand SVG support initially. Existing contribution SVG support is not removed. SVG brings XML/CSS/external-reference, filter and decoding complexity; supporting it for distribution means retaining isolated offline rasterization, bounded dimensions/time/concurrency and malformed/hostile-source tests. Raster PNG/WebP covers the initial need with less format complexity, though image decoders still require limits and isolation.
+
+## Validation required before implementing brand icons
+
+Contract/CLI tests should cover old manifests, optional fields, missing files, both themes, spoofed MIME, animation, oversized/zero dimensions, archive traversal and symlinks. Host tests should cover disabled installed packages without activation, source-only catalog fallback, stale update/uninstall results and no remote fetch. UI/native checks should cover all three surfaces, broken-image fallback, light/dark themes and accessible names. No new host, filesystem, network or terminal permission should be granted for displaying a verified logo.

docs/plugin-platform/plugin-icons.md

@@ -0,0 +1,81 @@
+# Add a plugin brand icon
+
+Brand icons appear on Community cards/details and Installed lists/details. They
+are optional; plugins without them retain a host-owned fallback. An icon does
+not activate code or grant plugin permissions.
+
+## Declare the icon
+
+Use the existing `IconReference` shape at the top level of `netcatty.plugin.json`:
+
+```json
+{
+  "engines": { "netcatty": ">=0.0.0", "api": ">=0.1.0-internal.1 <0.2.0" },
+  "features": { "required": ["metadata.brand-icon"] },
+  "icon": {
+    "kind": "package",
+    "light": "assets/logo-light.png",
+    "dark": "assets/logo-dark.webp"
+  }
+}
+```
+
+This is a manifest fragment. Preserve the required ID, name, version, publisher,
+main and other fields. The host-version value above is for this repository's
+unreleased development build (version 0.0.0); use the actual first supporting
+Netcatty release as your lower bound when it is assigned. Do not invent a release
+number. The API range and required feature enforce support in the meantime.
+
+Alternatively use a host-owned theme glyph, for example
+`"icon": { "kind": "theme", "name": "terminal" }`, with the same API/feature
+requirements. Theme glyphs use the existing host allowlist; unknown names fall back safely.
+
+## Prepare files
+
+Use a static PNG or WebP. A square transparent 128×128 or 256×256 image is
+recommended. Each source must be at most 256 KiB, with both dimensions between
+1 and 512 pixels. `dark` is optional; otherwise `light` is used in both themes.
+Use lowercase `.png` / `.webp` extensions matching the encoded bytes. Animated
+PNG/WebP and SVG are not accepted for brand icons. Existing contribution icons
+are unchanged, including their separately isolated SVG support.
+
+Paths are relative to the package root. URLs, absolute paths, traversal,
+backslashes and symlinks escaping the package are not supported. Include each
+referenced file in the package. No external image URL is loaded as a fallback.
+The host performs offline isolated decoding and displays a bounded PNG result;
+invalid or unreadable images fall back to the host glyph.
+
+## Validate and package
+
+From this repository, after building your plugin:
+
+```sh
+npm run build:plugin-packages
+node packages/plugin-cli/dist/cli.js validate examples/plugins/starter-netcatty
+node packages/plugin-cli/dist/cli.js compatibility examples/plugins/starter-netcatty --netcatty 0.0.0 --api 0.1.0-internal.1 --features metadata.brand-icon
+node packages/plugin-cli/dist/cli.js pack examples/plugins/starter-netcatty --out /tmp/starter-netcatty.ncpkg
+```
+
+Directory validation, packaging and imported-archive validation check declared
+brand files and bounds. The host reads installed metadata by plugin ID and
+verified package identity, not a renderer-provided file path. Disabled packages
+can display their icon; quarantined, missing or changed packages fall back. The
+existing enabled-only contribution icon service gate is not relaxed.
+
+## Community previews
+
+For an uninstalled plugin, the directory maintainer includes a reviewed raster
+preview in the application bundle. The preview binds the plugin ID, version,
+repository, source commit and icon declaration. Its bytes and SHA-256 are checked
+against the reviewed source files in tests. The current Starter preview uses its
+first-party source assets; source-only listings do not pretend to have a release
+artifact. Missing or mismatched previews use the same fallback, without fetching
+an image from the author's server. Submit the source assets and updated directory
+metadata through the existing repository PR review process.
+
+## Compatibility
+
+This is API/schema revision `0.1.0-internal.1`. An older host rejects the unknown
+manifest field or missing required feature. The new host continues to offer
+`0.1.0-internal` for legacy plugins without the new field, including exact old
+API ranges. Existing plugins need no manifest or data migration.

docs/plugin-platform/registry-client.md

@@ -0,0 +1,56 @@
+# Official registry client
+
+The Community page refreshes the fixed endpoint
+`https://raw.githubusercontent.com/binaricat/netcatty-plugins/main/catalog.json`
+in the main process. The renderer cannot choose a registry URL. This endpoint
+must be published separately; client implementation and synthetic tests do not
+prove the repository or an online artifact is available.
+
+## Catalog contract
+
+`catalog.json` is an array of at most 1,000 current entries. Each entry supplies
+`id`, `version`, `name`, `description`, `author`, `repository` (`owner/repository`),
+`commit` (full 40-character SHA), `license`, `readme` (relative Markdown path),
+and `manifest`. Optional `artifact` contains `url` and SHA-256 `sha256`.
+Unknown catalog-entry and artifact fields are rejected. The whole JSON value,
+including manifest defaults, uses the existing 128-level / 100,000-value budget
+and finite-number validation. The existing manifest schema, browser-only distribution policy, identity/version
+and license checks apply. Source-only entries remain build-and-import examples.
+No download counts, ratings, or timestamps are invented. Brand previews remain
+bundled and reviewed; arbitrary author image URLs are never loaded.
+
+Reads are anonymous HTTPS, redirect-free for the registry, bounded to 2 MiB,
+and time out after 30 seconds. All entries must validate, safely clone, and generate every selection token before
+atomically replacing the current snapshot. Invalid JSON/schema, network failure, and oversized responses
+leave the previous good snapshot intact. Errors and Retry remain visible. The Community header also has Refresh, including
+when the last refresh succeeded; it is disabled while a request is pending.
+The last good catalog is retained **in memory for this application session**;
+a fresh offline launch uses bundled examples. There is no new disk cache,
+database migration, cloud sync record, or credential requirement.
+
+## Selection and installation
+
+Each returned entry has a host-generated `selectionToken` covering its complete
+JSON contents. This is a concurrency check, **not a signature or trust proof**.
+README requests must still match that selection and fetch its pinned source
+commit. A changed entry requires refresh and renewed review.
+
+A manual install must first refresh the official catalog successfully and match
+the selected token again. Failed refresh is browse-only, even if the cached
+entry has an artifact. Withdrawal, version changes, permission changes, README
+changes, or artifact hash changes cannot silently replace the selected package.
+Archive download then uses the existing approved-host, size, exact SHA-256,
+manifest and package validation pipeline. Installation leaves the plugin disabled;
+existing authorization gates still apply on activation/use.
+
+`index.json` release history and withdrawal records are not consumed by this
+first client. Removing an entry does **not** disable, uninstall, update, or delete
+data from an already installed plugin. There are no background code updates.
+
+## Verification boundary
+
+Service regressions use synthetic network responses and package bytes; the
+existing package manager tests cover archive admission. No third-party plugin,
+real credential, real sync account, or live registry write is used. Native QA
+must separately verify the visible offline/retry state and eventual real catalog
+availability once the repository is published.

docs/plugin-platform/review-2026-10.md

@@ -43,15 +43,17 @@ directory was present at this baseline.
 User approved public source plus a clear license for catalog entries, and manual
 confirmation of plugin updates. Private local packages remain separate.
 
-Recommended public v1 eligibility: browser runtime only. Utility Node, native
+User-approved public v1 eligibility: browser runtime only. Utility Node, native
 companions and raw terminal interceptors retain the development preview path.
 This excludes advanced provider implementations requiring Node/native binaries;
 ordinary browser contributions, broker-backed networking and providers remain
-possible. This policy needs product confirmation; no existing advanced path is
-removed by this review.
+possible. No existing local advanced development path is removed.
 
-Keep `NETCATTY_PLUGIN_DEV=1` until distribution trust, permission UI, compatibility
-migration and native acceptance are reviewed. Passing tests is not proof of
+After product review, normal Settings now admits browser-only packages. The
+`NETCATTY_PLUGIN_DEV=1` flag gates advanced local packages only; their existing
+permission prompts remain mandatory. Shared host/UI classification preserves
+browser-first placement for dual-entry packages while excluding them from normal
+admission. Native acceptance remains pending. Passing tests is not proof of
 security isolation. Do not describe utility processes as broker-constrained.
 
 A future KV sync feature needs an explicit manifest opt-in schema, size limits,
@@ -65,3 +67,13 @@ A hash mismatch must fail rather than fall back to latest. README must not execu
 HTML or automatically fetch remote media. Directory PR checks are a bounded
 review process, not a security certification or a guarantee that maintainers will
 repair third-party plugins.
+
+## Validation at the implementation stage
+
+The full repository TypeScript check has 773 diagnostics on both the frozen main
+and this implementation. After normalizing worktree paths and line shifts, no
+new diagnostics were introduced. This existing debt includes plugin integration
+types and should be addressed in a separate API-drift cleanup rather than being
+hidden by changing public contracts opportunistically. Canonical contract drift
+checking and plugin runtime tests pass for this implementation; native Electron
+UI acceptance is tracked separately in `native-acceptance.md`.

docs/plugin-platform/security-and-permissions.md

@@ -226,3 +226,33 @@ after durable user data can exist.
 - PR 9 supplies signed publisher principals and trust policy through placement;
   signed identity changes force a fresh grant instead of widening an unsigned
   grant silently.
+
+## Inspect and revoke actual grants
+
+The installed package detail separates declared permissions from **Saved
+grants**. The host-only panel lists resource, scope, session (when applicable),
+and grant time. Each row indicates whether its declaration hash and security
+principal match the host-owned current activation. Saved grants from an older
+package or a stopped/disabled activation remain visible as inactive. One-use decisions do not appear as retained grants. Refresh
+reads the engine again. Recent security events include at most 100 entries and
+project only event, time, permission, and scope. Arbitrary database details,
+operation IDs, terminal content, and credential material never cross this UI
+boundary.
+
+**Disable and revoke all grants** runs through the manager mutation queue. It
+persists disabled state before revoking grants, invalidates contributions, and
+waits for runtime shutdown. Existing runtime teardown cancels RPC, streams,
+leases, providers, and companions. Every cleanup stage is attempted if grant deletion, audit persistence, or
+contribution invalidation fails. Multiple errors are aggregated and reported;
+the UI never claims successful revocation when persistence or cleanup failed. Explicit enable requests fresh access.
+This management bridge is available only to the trusted app renderer. It is
+not a plugin RPC method and grants no plugin authority over another package.
+
+`PluginNetworkRequest` and `PluginNetworkResponse` now derive from the canonical
+schema. `credentialLease` and `authorization` describe the existing host lease
+injection path. Hosts advertise `network.credential-lease` for discovery without
+changing existing API versions or disabling legacy requests. Plugins may
+require that feature or handle its absence. Optional authorization defaults to
+Bearer. Basic authorization accepts a bounded username. Plaintext is redeemed
+only inside the host after origin permission and operation binding checks.
+See the [synthetic fixture](../../examples/plugins/lease-http/README.md).

docs/plugin-platform/terminal-sharing-wip.md

@@ -0,0 +1,51 @@
+# Selected terminal sharing — implementation WIP
+
+Base: ThemePack `f868221b5f11810802f929369ac8eee46166079a`.
+Branch: `feat/plugin-terminal-sharing`. This is saved unfinished source, not an
+accepted API or an installable/native-tested workflow. Do not merge or release.
+
+Implemented source so far:
+
+- Canonical optional action-only `terminal.selection.read`, feature
+  `terminal.selection-sharing`, bounded result and host-target schemas; SDK
+  `context.terminals.shareSelection()` and runtime forwarding through the
+  existing `ui.interact` broker. No independent parallel RPC stack.
+- Main-only worker/session generation and window-owner binding accessor; no
+  endpoint or Host DTO returned to plugins.
+- Host target/handle authority, opaque signed short-lived receipts, capacity,
+  expiry and lifecycle hooks; no selected text stored in the authority.
+- Broker admission binding to the selected resource before a once-only grant,
+  signed Preview/Share phases, fixed audit metadata and teardown integration.
+- Trusted app-only selected-target setter, not a plugin API. No database,
+  installation/source/cache identity or private-storage schema changes.
+
+Still missing, and required before this counts as working:
+
+1. Trusted renderer target publication for the real active terminal/workspace;
+   actual bounded selection reader registered by the terminal surface. Read
+   only on Preview, from a visible connected terminal, never through Agent/MCP
+   history/context readers; refuse sensitive input, empty or oversized selection.
+2. Host dialog Preview response and explicit Share rendering, failure states,
+   exact resource/selection consistency and global lifecycle verification.
+3. Canonical/SDK/broker/authority/real-worker/renderer normal and boundary tests,
+   generated-contract and compatibility review (including optional-only
+   declaration semantics), quotas, owner/reconnect/close/revoke/late-result cases.
+4. Useful ordinary-browser synthetic example, fixture ID/hash/precise permissions,
+   build/CI, independent review/fix/review and parent-owned native acceptance.
+5. Separate input-draft layer: reuse the actual compose control without inheriting
+   broadcast targets, overwriting an existing draft silently, writing PTY bytes
+   or sending Enter. Require a separately approved target-bound draft action and
+   final active identity check. No input-proposal method/permission is delivered
+   by this WIP.
+
+Known integration constraints:
+
+- The market source-binding task owns installation, cache, authorization/private
+  storage identity and associated database schema. Coordinate before touching
+  those locations; runtime/assertActive identity must remain host-owned.
+- Keep the ThemePack security-color delta in its own branch/head. Incorporate
+  the eventually accepted head with a normal integration merge, not by rewriting
+  frozen evidence.
+- The user allows simplification of unreleased plugin historical data/protocols;
+  do not add legacy migration layers. Do not remove unrelated host/input data
+  migrations or weaken the sandbox.

docs/plugin-platform/terminal-sidebar.md

@@ -0,0 +1,74 @@
+# Terminal sidebar pages
+
+The `terminal-sidebar` view location requires `views.terminal-sidebar` and the
+existing `views` permission. This adds navigation and plugin-owned content to
+the existing terminal pane/split system. It is not a session-data capability,
+Provider subscription, terminal history reader or command execution API.
+
+## Host-owned navigation
+
+An Extension pages menu in the normal terminal toolbar lists visible pages
+with their plugin source. Selecting one switches the existing focused pane;
+selecting an already-open tool focuses that pane. Existing split menus include
+the same contributions and enforce unique tools and the eight-pane limit.
+Host-generated `plugin-view:<namespaced-view-id>` keys cannot replace built-in
+tools. Declared order and ID determine listing order; existing host docking,
+split resizing, magnification and close controls remain authoritative.
+
+The manager's internal Open event can select a page only when an open terminal
+is already selected. Otherwise the host asks the user to select a terminal; it
+does not connect or open a saved host. Launcher events target the session from
+the actual host terminal toolbar and are rechecked against current selection.
+These are internal host UI events, not public SDK router methods or trusted
+plugin `userGesture` flags.
+
+## Session ownership without data sharing
+
+The renderer binds each page to the actual terminal tab/workspace and current
+focused child session. It passes only `netcatty.surface: terminal-sidebar` as
+the view context. Internal ownership IDs are used for host state scoping, not
+returned to the page or treated as resource grants. A future selected-session
+data API must establish its own live endpoint authority and permissions.
+
+Changing terminal tabs or workspace focus closes the old native view before
+the new one can receive focus. Session removal, pane close, withdrawal of a
+visible contribution, disable/update/uninstall and runtime loss remove the
+affected page. Unknown saved routes are pruned without opening them; restoring
+a layout never grants the page or any session-data permission. State buckets
+are for the plugin's own UI data, not an isolation boundary against that same
+plugin's already-authorized own-state API. Ordinary KV does not become synced.
+
+PersistentSidePanelPortal moves a stable mount between the actual pane,
+magnification host and hidden parking host. There is no fallback native view
+over the entire terminal layer. Native geometry follows host DOM relocation,
+resize and scrolling; duplicate geometry updates are suppressed. Hidden/inert
+or parked mounts cannot reveal a native view.
+
+## Focus and security surfaces
+
+The existing sandbox ViewHost, immutable package/protocol checks, own-command
+and view-state boundaries are reused. Embedded pages start hidden. Host
+dialogs and overlapping portals hide them, and main-process App Lock closes
+them. Escape is host-owned and closes the plugin pane.
+
+Native WebContents focus is reported only to its actual owner's trusted
+renderer using a canonical instance-ID event. It updates the selected pane;
+it does not expose an Electron object to the plugin. Revealing multiple panes
+does not focus all of them: only the host-selected pane can request focus.
+The main process verifies actual owner, visibility, foreground and unlocked
+state before honoring that request. A plugin has no SDK method to invoke the
+host focus bridge. No session or page text is added to focus/audit logs.
+
+## Example and evidence
+
+`com.netcatty.session-scratchpad` 0.1.0 asks only for its own `views`. It saves,
+reopens and clears explicitly typed synthetic text. Package instructions and
+minimal native actions are in its README. Repository tests use real split
+tree, layout state, persistent portal, launcher and embedded-view components;
+host tests cover owner-bound focus, hidden/locked refusal and withdrawal.
+Feature and permission admission, limits, old APIs and previous Vault/command
+fixes are checked on the same stack. Independent review, exact-SHA CI and
+parent native QA remain separate acceptance gates recorded on the Draft PR.
+
+ThemePack, selected context/terminal drafts and SFTP handles remain subsequent
+bounded stages. Adding a sidebar page does not count as implementing them.

docs/plugin-platform/theme-packs.md

@@ -0,0 +1,135 @@
+# Host color theme packs
+
+Theme packs contribute validated light and dark host colors. They cannot inject
+CSS, access host DOM, change layout, load remote resources, replace security
+controls, or apply themselves. The feature is `appearance.theme-packs`.
+
+## Install and select
+
+Use normal Settings > Plugins to install and enable a package. In Appearance,
+choose a plugin theme for the current light or dark mode, then select Preview or
+Apply. Preview changes only the current window and writes no preference. Cancel,
+closing Appearance, changing mode, package withdrawal, or a newer committed
+revision ends that preview. Apply saves a host-owned, device-local choice and
+refreshes other application windows. Restore default clears the plugin choice
+for that mode and selects Snow or Midnight. Selecting a built-in swatch also
+clears that mode's plugin choice. Failures remain visible and are not reported as
+successful applications.
+
+The current view environment is globally broadcast. To keep temporary previews
+local, it publishes **committed** theme tokens only. Plugin pages follow an
+applied theme through their existing environment subscription; they do not
+receive another window's temporary preview. This does not add an owner-local
+view environment API.
+
+## Data-only package
+
+A pure theme uses `main: { "data": "theme" }`, contributes only `themes`, and
+omits permissions, activation events and companions. Its code runtime is never
+started, including by the runtime supervisor's startup or explicit-start path.
+Browser code plugins may also declare themes; choosing a theme does not start a
+runtime or grant their functional permissions. Only enabled packages appear.
+
+```json
+{
+  "features": { "required": ["appearance.theme-packs"] },
+  "main": { "data": "theme" },
+  "contributes": {
+    "themes": [{
+      "id": "com.example.colors.forest",
+      "label": "Forest",
+      "variant": "light",
+      "entry": "forest.json"
+    }]
+  }
+}
+```
+
+This fragment belongs in an otherwise complete manifest. Contribution IDs use
+the package namespace. Palette paths are package-relative JSON files, included
+and checked by the normal CLI/package store. Hosts lacking the required feature
+reject compatibility deterministically.
+
+```json
+{ "formatVersion": 1, "base": "light", "colors": { "accent": "#166534" } }
+```
+
+Colors merge onto a fixed accessible light/dark host base. Only opaque `#RRGGBB`
+values and canonical semantic keys are accepted. The 15 editable keys cover
+background/foreground, card and popover pairs, secondary and muted pairs, accent,
+destructive and its foreground, border and input. Primary, ring and the accent
+foregrounds are derived together, matching the existing theme conversion.
+Nineteen output fields are not nineteen independent controls.
+
+Each package has at most 32 themes; each palette is at most 64 KiB; the catalog
+and validated cache contain at most 256 entries. Schema and contrast checks run
+before catalog publication. Text pairs and state colors require at least 4.5:1;
+control borders and focus information require at least 3:1 against their
+surfaces. Invalid palettes produce bounded, content-free diagnostics and cannot
+be previewed or applied. Files are read from verified immutable package roots,
+with bounded reads and a no-follow final file open.
+
+## Ownership, recovery and security appearance
+
+The host stores selections separately from plugin KV, settings sidecars and
+cloud sync. A reference binds plugin ID, theme ID, exact version, archive digest
+and variant. Application uses a revision check plus an active-package check just
+before the atomic preference/audit transaction. An audit write failure rolls
+back the selection. Audit records contain revision/action metadata, not palette
+or user content.
+
+Disable, uninstall, update, missing entries and integrity failures withdraw the
+palette. A saved missing reference remains visible as unavailable while the
+same-mode safe host palette is used; a changed package is not automatically
+applied. Preview owner and committed revision checks prevent a late cancellation
+from replacing another preview or a newer application.
+
+Host dialogs, App Lock, grant/revoke, host details, keychain panels, host-key
+prompts and the credential picker use fixed host security variables while a
+plugin theme is active. The pack controls no font, icon, opacity, CSS selector,
+button text or ordering. System forced-colors/high-contrast preferences use a
+fixed host high-contrast fallback. Personal accent, fonts, terminal choices and
+accessibility preferences retain their authority. Existing personal custom CSS
+remains a user setting and is not exposed to plugins.
+
+This first layer changes host semantic colors. Static terminal palette linkage,
+custom high-contrast variants, fonts, density, icons and backgrounds remain
+separate bounded follow-ups; their fields are not silently accepted here.
+
+## Example and validation
+
+`examples/plugins/forest-theme-pack` is a four-file data package with light and
+dark Forest accents. It requests no permissions and contains no JavaScript.
+The starter, Vault Scratchpad and Session Scratchpad pages now subscribe to the
+existing seven public HSL tokens through `theme.js`, dispose on page hide, and
+use responsive host-colored controls. No new styling RPC is needed.
+
+Local evidence includes normal CLI validation/packing, schema/admission and
+no-runtime checks; host catalog/identity/size/contrast/CAS/migration/atomic-audit
+checks; picker preview/apply/cancel/reset and stale-owner/withdrawal/high-contrast
+checks; and view-template initial/live environment/disposal checks. Exact-SHA
+CI, independent review and parent native multi-window/security-surface acceptance
+remain separate delivery gates. Local production builds do not establish them.
+
+### First review / CI delta
+
+The first review found that muted text was validated only against its namesake
+muted surface, although host descriptions and statuses also use it on background,
+card and popover surfaces. The validator now checks generic and muted text on
+all neutral surfaces that reuse those tokens. The white-on-white counterexample
+is rejected both by the pure validator and the host catalog. Forest light/dark
+palettes remain valid.
+
+The first exact-head test run `40317690002` failed with 15187 passing tests,
+one failure and 50 skips. Its single failure was the unchanged TERM-SSHD
+concurrent failure-release test expecting a particular invocation to reach OPEN
+first. Both calls perform asynchronous local-file preparation. The test now
+requires exactly one explicit Permission denied result, one successful result
+with matching bytes, and no rejected concurrent handle; it retains concurrency
+without assuming filesystem completion order. No transfer implementation changed.
+The test file's original SHA256 was identical in e5bd294c, 733f44c and fdeeaf74:
+`8b200d9f6a05ac5cd91fe4e0a95ea36a770d22267a6a0162b4c9fc927beb52a7`.
+This is source identity and a source-based ordering diagnosis, not a claim that a
+baseline runtime failure was reproduced locally. The updated test needs the new
+exact-head CI result. That same first run passed the added Vite browser-import
+smoke, resolving the earlier local temp-directory limitation for that head.

docs/plugin-platform/vault-pages.md

@@ -0,0 +1,80 @@
+# Vault extension pages
+
+`views.vault-pages` adds the `vault-page` view location. A package must require
+the feature and declare the existing `views` permission. Hosts without the
+feature reject the package deterministically. Existing view locations and API
+versions keep their behavior; there is no public plugin router or new Vault
+read/write permission.
+
+## User workflow
+
+Visible, enabled contributions appear in Vault's **Extensions** group. The
+host generates a namespaced route from the declared view ID, orders by declared
+order and ID, localizes the label, and resolves the declared icon through the
+existing safe icon pipeline. Built-in navigation and security entry points
+remain host-owned. Collapsed navigation retains source-labelled accessible
+buttons.
+
+Selecting a page mounts its existing sandbox WebContentsView in the Vault main
+content area. It does not create a top tab, use an aside overlay, open a
+connection, or share host/session/Vault records. The trusted host context
+contains only `netcatty.surface: vault-page`. The manager's existing Open action
+can select the same page through an internal host event; this is not exposed
+as a generic SDK navigation capability.
+
+The `vault-scratchpad` browser example lets the user type synthetic text, save
+it in the plugin's own view state, return to Hosts, reopen, and clear it. It
+does not create a Vault Note or enable automatic cloud sync. The fixture asks
+for only `views`; granting it does not approve another plugin or data access.
+
+## Ownership and lifecycle
+
+The host owns the route and validates the selected contribution against the
+current visible catalog. Missing IDs, disable/uninstall/update, a false `when`,
+failed activation or a host close return to Hosts. Focus restoration checks
+the current section and active tab so an old fallback cannot steal focus after
+a newer selection. Catalog listing does not activate a plugin.
+
+The embedded host reuses PluginViewHost, its ephemeral session, CSP, no-Node
+preload, protocol validation, own-command checks, and bounded own view state.
+No DOM or Electron object enters the SDK. A window-route-and-slot scope separates
+this page's state from other view placements; actual BrowserWindow ownership is
+validated separately and does not rely on that state key. This initial embedded slice
+closes on navigation away even if `retainContextWhenHidden` is declared.
+
+Each opening reserves an instance ID owned by its actual BrowserWindow before
+asynchronous activation. Close can cancel that reservation before native
+construction. Owner closure, shutdown and renderer cleanup prevent a late open
+from attaching; late responses are also closed by the renderer lifecycle
+controller. Current plugin version/runtime and `when` are checked before
+attachment and on subsequent contribution changes. Existing owner checks apply
+to bounds, visibility, close and view-state IPC.
+
+Host reload/renderer exit and a view renderer crash close the associated native
+page. Plain Escape in a Vault page is handled by the host and returns to Hosts;
+it does not dispatch a plugin command or expose a general navigation API.
+
+Native child views sit above React portals. A Vault page starts hidden; the
+trusted renderer reveals it only after checking the mount and host dialogs,
+menus, popovers, overlay panels and lock surfaces. Overlapping host surfaces
+hide the page. App Lock additionally closes all hosted plugin views and
+cancels pending opens in the main process; showing a view while locked fails.
+
+The shared manifest bound remains 128 views per package. Only one Vault page is
+mounted per owner; listing and routing do not create a background view queue.
+View-state JSON size limits and existing runtime/permission quotas remain in
+force. No page text or state is added to audit logs by this adapter.
+
+## Validation status
+
+Source tests cover normal catalog selection, the actual embedded content slot,
+host-modal occlusion, synchronous tab-away cleanup, withdrawn and invalid
+routes, internal host selection, delayed open cancellation, feature/permission
+admission, host ownership, `when` withdrawal and App Lock. Production build,
+aggregate host tests and precise-SHA CI are reported on the accompanying Draft
+PR. Parent native acceptance must use the packed browser example through
+normal Settings and record its exact source SHA/package hash. Unit tests do
+not substitute for that native acceptance.
+
+Terminal sidebar pages and selected-session DTOs remain separate stages. This
+page location does not make those capabilities available.

domain/pluginPermissionDescriptions.cjs

@@ -0,0 +1,46 @@
+"use strict";
+
+// Presentation only. Admission and grants remain owned by the canonical schema
+// and permission engine. Tests require exact coverage of its permission enum.
+const PERMISSION_DESCRIPTIONS = {
+  storage: [false, "Plugin storage", "Save and read this plugin's local data.", "插件存储", "保存和读取此插件自己的本地数据。"],
+  "runtime.advanced": [true, "Full device access", "Run Node code with filesystem and network access outside broker restrictions. Developer mode only.", "完整设备访问", "运行 Node 代码，可直接访问文件系统和网络，不受代理权限限制。仅限开发者模式。"],
+  "settings.read": [false, "Read plugin settings", "Read this plugin's configured preferences.", "读取插件设置", "读取此插件自己的设置。"],
+  "settings.write": [false, "Change plugin settings", "Update this plugin's preferences.", "修改插件设置", "修改此插件自己的设置。"],
+  commands: [false, "Plugin commands", "Register and run this plugin's own commands.", "插件命令", "注册和执行此插件自己的命令。"],
+  menus: [false, "Menu entries", "Add this plugin's actions to host menus.", "菜单入口", "将此插件的操作加入应用菜单。"],
+  "ui.interact": [false, "Host prompts", "Ask the host to show bounded input and choice dialogs.", "宿主交互", "请求宿主显示有界的输入和选择对话框。"],
+  views: [false, "Plugin panels", "Display plugin-owned panels inside the app.", "插件面板", "在应用中显示插件自己的面板。"],
+  "clipboard.read": [true, "Read clipboard", "Read copied text, which may contain passwords or other sensitive data.", "读取剪贴板", "读取复制的文本，其中可能包含密码或其他敏感数据。"],
+  "clipboard.write": [true, "Write clipboard", "Replace clipboard content that you may paste elsewhere.", "写入剪贴板", "替换剪贴板内容，可能影响你随后粘贴的数据。"],
+  "terminal.selection.read": [true, "Share terminal selection", "Read only text explicitly previewed and shared from the selected live terminal. It may contain secrets. Each action requires approval.", "分享终端选区", "仅读取用户从当前活跃终端明确预览并分享的文本，可能包含秘密；每次操作均需确认。"],
+  "terminal.metadata": [true, "Terminal metadata", "Read terminal/session details that may identify hosts and activity.", "终端元数据", "读取终端和会话信息，可能暴露主机及操作活动。"],
+  "terminal.output": [true, "Read terminal output", "Receive terminal output through supported providers; it may contain credentials or private data.", "读取终端输出", "通过支持的提供器接收终端输出，其中可能包含凭据或隐私信息。"],
+  "terminal.input": [true, "Send terminal input", "Send input to a terminal; input may execute commands or change a remote host.", "发送终端输入", "向终端发送输入，可能执行命令或更改远程主机。"],
+  "terminal.decorate": [false, "Terminal presentation", "Provide annotations and visual changes to terminal content.", "终端展示", "为终端内容提供标注和视觉效果。"],
+  "terminal.complete": [true, "Terminal completion", "Receive completion context and suggest terminal input.", "终端补全", "接收补全上下文并建议终端输入。"],
+  "terminal.intercept.input": [true, "Rewrite terminal input", "Inspect and modify input before delivery. Not every secret/no-echo input can be detected. Developer mode only.", "改写终端输入", "检查并修改发送前的输入。无法识别所有秘密或无回显输入。仅限开发者模式。"],
+  "terminal.intercept.output": [true, "Rewrite terminal output", "Inspect and modify output, including information shown as command results. Developer mode only.", "改写终端输出", "检查并修改输出，包括呈现为命令结果的信息。仅限开发者模式。"],
+  "vault.metadata": [true, "Host inventory", "Read host metadata that can reveal infrastructure details.", "主机清单", "读取主机元数据，可能暴露基础设施信息。"],
+  "vault.write": [true, "Change host inventory", "Request changes to stored host records.", "修改主机清单", "请求更改保存的主机记录。"],
+  "vault.credentials": [true, "Use host credentials", "Use approved host credential references through operation-bound leases; this can authenticate to hosts.", "使用主机凭据", "通过绑定操作的租约使用已批准的主机凭据引用，可能用于向主机认证。"],
+  "sftp.read": [true, "Read remote files", "Read remote file content through supported host APIs.", "读取远程文件", "通过支持的宿主 API 读取远程文件内容。"],
+  "sftp.write": [true, "Change remote files", "Write or change remote files through supported host APIs.", "修改远程文件", "通过支持的宿主 API 写入或修改远程文件。"],
+  network: [true, "Network requests", "Contact approved origins. Data sent to them leaves this device.", "网络请求", "访问已批准的网络来源。发送的数据会离开此设备。"],
+  "filesystem.read": [true, "Read local files", "Read approved local paths, which may contain sensitive files.", "读取本地文件", "读取已批准的本地路径，其中可能包含敏感文件。"],
+  "filesystem.write": [true, "Change local files", "Write to approved local paths; existing content may be changed.", "修改本地文件", "写入已批准的本地路径，可能改变现有文件内容。"],
+  secrets: [true, "Plugin secrets", "Store and use this plugin's secrets through OS-backed storage and controlled leases.", "插件秘密", "通过系统密钥存储与受控租约保存和使用此插件的秘密。"],
+  "companion.execute": [true, "Run native programs", "Launch digest-verified companion executables with device authority. Developer mode only.", "运行本机程序", "启动经过摘要校验的辅助可执行程序，拥有设备权限。仅限开发者模式。"],
+  "provider.terminal": [true, "Terminal providers", "Provide terminal features; separate permissions govern access to terminal data.", "终端提供器", "提供终端扩展功能；终端数据访问由额外权限控制。"],
+  "provider.connection": [true, "Connection provider", "Implement a connection backend and handle its session data.", "连接提供器", "实现连接后端并处理对应会话数据。"],
+  "provider.authentication": [true, "Authentication provider", "Participate in login challenges using approved credential leases.", "认证提供器", "使用已批准的凭据租约参与登录验证。"],
+  "provider.sync": [true, "Encrypted sync storage", "Store encrypted sync objects; this permission does not provide the master key or plaintext vault.", "加密同步存储", "存储加密同步对象；此权限不提供主密钥或明文凭据库。"],
+  "provider.importer": [true, "Import provider", "Parse user-selected files into drafts for host review; input files may be sensitive.", "导入提供器", "解析用户选择的文件并生成供宿主确认的草稿；输入文件可能包含敏感数据。"],
+};
+function describePluginPermission(permission, locale = "en") {
+  const entry = Object.hasOwn(PERMISSION_DESCRIPTIONS, permission) ? PERMISSION_DESCRIPTIONS[permission] : null;
+  const chinese = locale.startsWith("zh");
+  if (!entry) return { known: false, sensitive: true, label: chinese ? "无法识别的权限" : "Unrecognized permission", description: chinese ? "此版本无法识别该权限，拒绝授权。" : "This version does not recognize this permission. Access is denied." };
+  return { known: true, sensitive: entry[0], label: entry[chinese ? 3 : 1], description: entry[chinese ? 4 : 2] };
+}
+module.exports = { PERMISSION_DESCRIPTIONS, describePluginPermission };

domain/pluginPermissionDescriptions.test.cjs

@@ -0,0 +1,15 @@
+const assert = require('node:assert/strict');
+const test = require('node:test');
+const schema = require('../packages/plugin-contract/schema/plugin-contract.schema.json');
+const { PERMISSION_DESCRIPTIONS, describePluginPermission } = require('./pluginPermissionDescriptions.cjs');
+test('permission explanation coverage cannot drift from the canonical permission catalog', () => {
+  assert.deepEqual(Object.keys(PERMISSION_DESCRIPTIONS).sort(), [...schema.$defs.PluginPermission.enum].sort());
+  for (const id of schema.$defs.PluginPermission.enum) {
+    for (const locale of ['en', 'zh-CN']) {
+      const description = describePluginPermission(id, locale);
+      assert.equal(description.known, true); assert.ok(description.description.length > 5);
+    }
+  }
+  assert.equal(describePluginPermission('unknown.permission').sensitive, true);
+  assert.equal(describePluginPermission('unknown.permission').known, false);
+});

domain/pluginRuntimePolicy.cjs

@@ -0,0 +1,45 @@
+"use strict";
+
+// Shared by host placement, release admission, and the installed-package UI.
+// A Node entrypoint does not change default placement, but is not admitted to
+// the normal browser-only product path.
+function isStaticThemePack(manifest) {
+  return manifest?.main?.data === "theme" && Object.keys(manifest.main).length === 1
+    && Array.isArray(manifest.contributes?.themes) && manifest.contributes.themes.length > 0
+    && Object.keys(manifest.contributes).every((key) => key === "themes")
+    && !Object.keys(manifest.permissions ?? {}).length && !manifest.activationEvents?.length
+    && !manifest.companionExecutables?.length
+    && manifest.features?.required?.includes("appearance.theme-packs");
+}
+function describePluginRuntime(manifest) {
+  const providers = manifest?.contributes?.providers ?? [];
+  const permissions = [...(manifest?.permissions?.required ?? []), ...(manifest?.permissions?.optional ?? [])];
+  const permissionIds = permissions.map((entry) => typeof entry === "string" ? entry : entry.permission);
+  const hasCompanions = Boolean(manifest?.companionExecutables?.length);
+  const hasInterceptors = providers.some((provider) => (
+    provider.kind === "terminal.interceptor.input" || provider.kind === "terminal.interceptor.output"
+  ));
+  const declaresAdvanced = permissionIds.some((permission) => [
+    "runtime.advanced", "companion.execute", "terminal.intercept.input", "terminal.intercept.output",
+  ].includes(permission));
+  const hasBrowser = Boolean(manifest?.main?.browser);
+  const hasNode = Boolean(manifest?.main?.node);
+  const defaultRuntimeKind = hasBrowser && !hasCompanions && !hasInterceptors ? "browser" : "utility";
+  return {
+    defaultRuntimeKind: isStaticThemePack(manifest) ? "data" : defaultRuntimeKind,
+    dataOnly: isStaticThemePack(manifest),
+    hasNode,
+    declaresAdvanced,
+    browserOnly: !manifest?.main?.data && hasBrowser && !hasNode && !hasCompanions && !hasInterceptors && !declaresAdvanced,
+  };
+}
+
+function assertBrowserOnlyPlugin(manifest) {
+  if (!describePluginRuntime(manifest).browserOnly && !isStaticThemePack(manifest)) {
+    const error = new Error("This package requires advanced developer mode; normal plugin management accepts browser-only packages");
+    error.code = "PLUGIN_UNSUPPORTED_RUNTIME";
+    throw error;
+  }
+}
+
+module.exports = { describePluginRuntime, assertBrowserOnlyPlugin, isStaticThemePack };

domain/pluginRuntimePolicy.test.cjs

@@ -0,0 +1,27 @@
+const assert = require('node:assert/strict');
+const test = require('node:test');
+const { describePluginRuntime, assertBrowserOnlyPlugin } = require('./pluginRuntimePolicy.cjs');
+
+test('dual entrypoints retain browser default placement but require developer admission', () => {
+  const manifest = { main: { browser: 'browser.js', node: 'node.js' } };
+  assert.equal(describePluginRuntime(manifest).defaultRuntimeKind, 'browser');
+  assert.equal(describePluginRuntime(manifest).hasNode, true);
+  assert.throws(() => assertBrowserOnlyPlugin(manifest), /developer mode/);
+});
+test('normal release admission rejects advanced declarations and privileged providers', () => {
+  assert.doesNotThrow(() => assertBrowserOnlyPlugin({ main: { browser: 'index.js' }, permissions: { required: ['settings.read', 'commands'] } }));
+  for (const permission of ['runtime.advanced', 'companion.execute', 'terminal.intercept.input', 'terminal.intercept.output']) {
+    for (const kind of ['required', 'optional']) {
+      assert.throws(() => assertBrowserOnlyPlugin({ main: { browser: 'index.js' }, permissions: { [kind]: [permission] } }), /developer mode/);
+    }
+  }
+  const manifest = { main: { browser: 'index.js', node: 'node.js' }, contributes: { providers: [{ kind: 'terminal.interceptor.input' }] } };
+  assert.equal(describePluginRuntime(manifest).defaultRuntimeKind, 'utility');
+  assert.throws(() => assertBrowserOnlyPlugin(manifest), /developer mode/);
+});
+
+test('normal admission accepts only explicit non-executable theme-only data packages',()=>{
+ const manifest={main:{data:'theme'},features:{required:['appearance.theme-packs']},contributes:{themes:[{id:'com.example.theme.light'}]}};
+ assert.doesNotThrow(()=>assertBrowserOnlyPlugin(manifest));assert.equal(describePluginRuntime(manifest).dataOnly,true);assert.equal(describePluginRuntime(manifest).defaultRuntimeKind,'data');
+ for(const change of [{main:{data:'theme',browser:'index.js'}},{permissions:{required:['network']}},{activationEvents:['onStartupFinished']},{contributes:{themes:[],commands:[]}}])assert.throws(()=>assertBrowserOnlyPlugin({...manifest,...change}),/developer mode/);
+});

domain/pluginThemePack.cjs

@@ -0,0 +1,145 @@
+"use strict";
+// Pure color projection. Package/wire schema validation belongs to the host.
+const LIGHT = Object.freeze({
+  background: "#ffffff",
+  foreground: "#161a1d",
+  card: "#ffffff",
+  cardForeground: "#161a1d",
+  popover: "#ffffff",
+  popoverForeground: "#161a1d",
+  secondary: "#e5e7eb",
+  secondaryForeground: "#161a1d",
+  muted: "#f0f2f4",
+  mutedForeground: "#374151",
+  accent: "#1d4ed8",
+  destructive: "#b91c1c",
+  destructiveForeground: "#ffffff",
+  border: "#6b7280",
+  input: "#6b7280",
+});
+const DARK = Object.freeze({
+  background: "#111827",
+  foreground: "#f9fafb",
+  card: "#1f2937",
+  cardForeground: "#f9fafb",
+  popover: "#1f2937",
+  popoverForeground: "#f9fafb",
+  secondary: "#374151",
+  secondaryForeground: "#ffffff",
+  muted: "#273244",
+  mutedForeground: "#e5e7eb",
+  accent: "#93c5fd",
+  destructive: "#fca5a5",
+  destructiveForeground: "#111827",
+  border: "#9ca3af",
+  input: "#9ca3af",
+});
+function rgb(hex) {
+  return [1, 3, 5].map(
+    (offset) => parseInt(hex.slice(offset, offset + 2), 16) / 255,
+  );
+}
+function luminance(hex) {
+  return rgb(hex)
+    .map((v) => (v <= 0.04045 ? v / 12.92 : ((v + 0.055) / 1.055) ** 2.4))
+    .reduce((s, v, i) => s + v * [0.2126, 0.7152, 0.0722][i], 0);
+}
+function contrast(a, b) {
+  const x = luminance(a),
+    y = luminance(b);
+  return (Math.max(x, y) + 0.05) / (Math.min(x, y) + 0.05);
+}
+function toHsl(hex) {
+  const [r, g, b] = rgb(hex),
+    max = Math.max(r, g, b),
+    min = Math.min(r, g, b),
+    delta = max - min,
+    l = (max + min) / 2;
+  let h = 0;
+  if (delta)
+    h =
+      (max === r
+        ? ((g - b) / delta + 6) % 6
+        : max === g
+          ? (b - r) / delta + 2
+          : (r - g) / delta + 4) * 60;
+  const s = delta ? delta / (1 - Math.abs(2 * l - 1)) : 0;
+  return `${h.toFixed(3)} ${(s * 100).toFixed(3)}% ${(l * 100).toFixed(3)}%`;
+}
+// A small margin covers rounding when hex colors become HSL CSS components.
+function resolveThemePalette(palette) {
+  const colors = {
+    ...(palette.base === "dark" ? DARK : LIGHT),
+    ...palette.colors,
+  };
+  for (const value of Object.values(colors))
+    if (!/^#[0-9a-f]{6}$/i.test(value)) throw new Error("Invalid theme color");
+  const pairs = [
+    ["foreground", "background"],
+    ["cardForeground", "card"],
+    ["popoverForeground", "popover"],
+    ["secondaryForeground", "secondary"],
+    ["mutedForeground", "muted"],
+    ["destructiveForeground", "destructive"],
+  ];
+  for (const [a, b] of pairs)
+    if (contrast(colors[a], colors[b]) < 4.51)
+      throw new Error("Theme text contrast is below 4.5:1");
+  // Host labels and descriptions reuse these text tokens across neutral
+  // surfaces; they do not always sit on their namesake background token.
+  for (const surface of ["background", "card", "popover", "secondary", "muted"])
+    for (const key of ["foreground", "mutedForeground"])
+      if (contrast(colors[key], colors[surface]) < 4.51)
+        throw new Error("Theme neutral-surface text contrast is below 4.5:1");
+  for (const surface of ["background", "card", "popover"]) {
+    for (const key of ["accent", "destructive"])
+      if (contrast(colors[key], colors[surface]) < 4.51)
+        throw new Error("Theme state contrast is below 4.5:1");
+    for (const key of ["border", "input"])
+      if (contrast(colors[key], colors[surface]) < 3.01)
+        throw new Error("Theme control contrast is below 3:1");
+  }
+  const foreground =
+    contrast(colors.accent, "#000000") >= contrast(colors.accent, "#ffffff")
+      ? "#000000"
+      : "#ffffff";
+  const tokens = Object.fromEntries(
+    Object.entries(colors).map(([k, v]) => [k, toHsl(v)]),
+  );
+  return Object.freeze({
+    ...tokens,
+    primary: tokens.accent,
+    primaryForeground: toHsl(foreground),
+    accentForeground: toHsl(foreground),
+    ring: tokens.accent,
+  });
+}
+function securityThemeTokens(mode, highContrast = false) {
+  const colors = highContrast
+    ? mode === "dark"
+      ? {
+          background: "#000000",
+          card: "#000000",
+          popover: "#000000",
+          foreground: "#ffffff",
+          cardForeground: "#ffffff",
+          popoverForeground: "#ffffff",
+          accent: "#ffff00",
+          border: "#ffffff",
+          input: "#ffffff",
+        }
+      : {
+          background: "#ffffff",
+          card: "#ffffff",
+          popover: "#ffffff",
+          foreground: "#000000",
+          cardForeground: "#000000",
+          popoverForeground: "#000000",
+          accent: "#000080",
+          border: "#000000",
+          input: "#000000",
+        }
+    : {};
+  return resolveThemePalette({ base: mode, colors });
+}
+module.exports = { resolveThemePalette, securityThemeTokens, contrast, toHsl };

domain/pluginThemePack.test.cjs

@@ -0,0 +1,33 @@
+const assert = require("node:assert/strict");
+const test = require("node:test");
+const {
+  resolveThemePalette,
+  securityThemeTokens,
+  contrast,
+} = require("./pluginThemePack.cjs");
+test("opaque accessible palettes derive coupled accent tokens and fixed high contrast fallback", () => {
+  for (const mode of ["light", "dark"]) {
+    const tokens = resolveThemePalette({ base: mode, colors: {} });
+    assert.equal(tokens.primary, tokens.accent);
+    assert.equal(tokens.ring, tokens.accent);
+    assert.equal(tokens.primaryForeground, tokens.accentForeground);
+    assert.ok(securityThemeTokens(mode, true));
+  }
+  assert.ok(contrast("#000000", "#ffffff") > 20);
+  assert.throws(
+    () =>
+      resolveThemePalette({ base: "light", colors: { foreground: "#ffffff" } }),
+    /contrast/,
+  );
+});
+
+test("generic and muted text stay readable on the neutral surfaces that use them", () => {
+  for (const colors of [
+    { muted: "#000000", mutedForeground: "#ffffff" },
+    { card: "#000000", cardForeground: "#ffffff" },
+    { popover: "#000000", popoverForeground: "#ffffff" },
+    { secondary: "#000000", secondaryForeground: "#ffffff" },
+  ]) {
+    assert.throws(() => resolveThemePalette({ base: "light", colors }), /contrast/);
+  }
+});

domain/sidePanelLayout.ts

@@ -1,4 +1,4 @@
-export type SidePanelTool =
+export type BuiltinSidePanelTool =
   | 'sftp'
   | 'browser'
   | 'scripts'
@@ -8,6 +8,12 @@ export type SidePanelTool =
   | 'system'
   | 'notes';
 
+export type SidePanelTool = BuiltinSidePanelTool | `plugin-view:${string}`;
+
+export function isPluginSidePanelTool(value: unknown): value is `plugin-view:${string}` {
+  return typeof value === 'string' && value.length <= 256 && /^plugin-view:[A-Za-z0-9_.-]+$/.test(value);
+}
+
 export type SidePanelSplitDirection = 'horizontal' | 'vertical';
 
 export type SidePanelPaneNode = {

domain/workspaceLayoutPreset.test.ts

@@ -90,6 +90,21 @@ test('sanitize accepts a valid saved preset and rejects malformed data', () => {
   );
 });
 
+test('plugin panes keep split uniqueness and limits; saved routes grant no availability and can be pruned', () => {
+  const tool = 'plugin-view:com.example.plugin.page' as const;
+  let layout = createSidePanelLayout('notes', 'notes');
+  layout = splitSidePanelPane(layout, 'notes', tool, 'vertical', { paneId: 'plugin', splitId: 'root' }, 600);
+  const unique = splitSidePanelPane(layout, 'notes', tool, 'vertical', { paneId: 'duplicate', splitId: 'unused' }, 600);
+  assert.equal(collectSidePanelPanes(unique.root).length, 2);
+  assert.equal(getFocusedSidePanelPane(unique).tool, tool);
+  assert.ok(createWorkspaceLayoutPreset(layout));
+  assert.equal(withoutUnavailableSidePanelTools(layout, (item) => item === 'notes')?.root.type, 'pane');
+  for (let i = 0; i < 10; i++) layout = splitSidePanelPane(layout, getFocusedSidePanelPane(layout).id,
+    `plugin-view:com.example.plugin.page${i}`, 'horizontal', { paneId: `p${i}`, splitId: `s${i}` }, 600);
+  assert.equal(collectSidePanelPanes(layout.root).length, 8);
+  assert.equal(sanitizeWorkspaceLayoutPreset({ version: 1, layout: { root: { id: 'invalid', type: 'pane', tool: 'plugin-view:../outside' }, focusedPaneId: 'invalid' } }), null);
+});
+
 test('sanitize rejects duplicate node ids', () => {
   assert.equal(
     sanitizeWorkspaceLayoutPreset({

domain/workspaceLayoutPreset.ts

@@ -3,6 +3,7 @@ import {
   closeSidePanelPane,
   collectSidePanelPanes,
   getFocusedSidePanelPane,
+  isPluginSidePanelTool,
   type SidePanelLayout,
   type SidePanelLayoutNode,
   type SidePanelTool,
@@ -32,7 +33,7 @@ const SIDE_PANEL_TOOLS: ReadonlySet<SidePanelTool> = new Set([
 ]);
 
 function isSidePanelTool(value: unknown): value is SidePanelTool {
-  return typeof value === 'string' && SIDE_PANEL_TOOLS.has(value as SidePanelTool);
+  return typeof value === 'string' && (SIDE_PANEL_TOOLS.has(value as SidePanelTool) || isPluginSidePanelTool(value));
 }
 
 function sanitizeSidePanelLayoutNode(

electron-builder.config.cjs

@@ -68,6 +68,9 @@ module.exports = {
         // Renderer and Mosh's main-process bootstrap share the same
         // fail-closed prompt classifier at runtime.
         'domain/terminalPromptSecurity.shared.cjs',
+        'domain/pluginRuntimePolicy.cjs',
+        'domain/pluginPermissionDescriptions.cjs',
+        'domain/pluginThemePack.cjs',
         // Main-process SSH, SFTP, and port-forward bridges share this matcher.
         // TypeScript under domain/ is excluded below, so the .cjs must be listed.
         'domain/systemManager/containerRuntime.shared.cjs',

electron/bridges/terminalWorkerManager.cjs

@@ -390,6 +390,7 @@ function createTerminalWorkerManager(options = {}) {
     onRendererEvent = null,
   } = options;
   let child = null;
+  let pluginSessionAuthorityEpoch = 0;
   const pending = new Map();
   const pendingOutput = new Map();
   const pendingOutputBytes = new Map();
@@ -1857,6 +1858,7 @@ function createTerminalWorkerManager(options = {}) {
       },
     });
     child = worker;
+    pluginSessionAuthorityEpoch++;
     worker.on?.("message", (message) => {
       if (child === worker) handleMessage(message);
     });
@@ -2246,6 +2248,14 @@ function createTerminalWorkerManager(options = {}) {
       if (!sessionId) return null;
       return sessionWebContentsIds.get(sessionId) ?? null;
     },
+    // Main-process resource authority only; never expose worker objects or endpoints.
+    getPluginSessionBinding(sessionId, webContentsId) {
+      const generation = sessionGenerations.get(sessionId);
+      if (!child || !Number.isSafeInteger(generation) || closedSessions.has(sessionId)
+        || pendingSessionStartSequences.has(sessionId) || outputRoutePending.has(sessionId)
+        || sessionWebContentsIds.get(sessionId) !== webContentsId || !isLiveWebContentsId(webContentsId)) return null;
+      return Object.freeze({ epoch: pluginSessionAuthorityEpoch, generation });
+    },
     getSessionHostId(sessionId) {
       if (!sessionId) return null;
       return sessionHostIds.get(sessionId) ?? null;