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Introduce a new TerminalTabDoubleClickBehavior setting (duplicate | copy | disabled) with default 'duplicate'. Add model field, normalization, default, and sync key (tabDoubleClickBehavior). UI: TerminalBehaviorSettings adds a Select; AppView and TopTabs pass the setting through; TopTabItems implements createTopTabSessionDoubleClickHandler to perform duplicate/copy with a safe fallback. Add i18n strings, settings search entry, and update tests to cover behavior and serialization. Improves user control over double-click actions on session tabs.