fix(fonts): allow the glued SFMono family in the picker (#3929)

Windows enumerates "SFMono Nerd Font" (name ID 16). The allowlist only
had "sf mono", and suffix matching requires a mono word boundary, so
the family was dropped.

Co-authored-by: 陈大猫 <binaricat@users.noreply.github.com>

lib/localFonts.test.ts

@@ -80,6 +80,22 @@ describe('queryLocalFonts deduplication', () => {
     assert.ok(!names.includes('Microsoft YaHei UI'));
   });
 
+  it('recognizes SFMono Nerd Font as a monospace terminal font (#3929)', async () => {
+    installMockWindow(async () => [
+      { family: 'SFMono Nerd Font' },
+      { family: 'SF Mono' },
+      { family: 'Segoe UI' },
+    ]);
+
+    const monoFonts = await getMonospaceFonts();
+    const names = monoFonts.map((f) => f.name);
+
+    // Glued typographic family (name ID 16) and the spaced family both belong.
+    assert.ok(names.includes('SFMono Nerd Font'));
+    assert.ok(names.includes('SF Mono'));
+    assert.ok(!names.includes('Segoe UI'));
+  });
+
   it('a second sequential call also reuses the resolved promise (no second API call)', async () => {
     let callCount = 0;
     installMockWindow(async () => {

lib/localFonts.ts

@@ -37,6 +37,9 @@ const KNOWN_MONOSPACE_FONTS = new Set([
     'victor mono',
     'ibm plex mono',
     'sf mono',
+    // Nerd Font / patched builds often use the glued typographic family
+    // "SFMono Nerd Font" (name ID 16), which does not match "sf mono" (#3929).
+    'sfmono',
     'operator mono',
     'input mono',
     'pragmata pro',