refactor(i18n): route remaining extension labels through the catalog (T-468)

Migrate the user-facing strings in menubar, output, search, deeplink, editor,
files, terminal, markdown, and vim to ClideSettings.i18n.string/.interpolated;
extend the existing catalogs and create the missing ones (deeplink, output,
search, markdown, menubar, vim). vim mode labels now resolve through
builtin.vim (default still `-- NORMAL --`, now localizable). A dock-status test
seeds builtin.output so the widget's own i18n lookups resolve instead of
warning into the logRing it counts. No en_US behaviour change (D-21).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/builtin/menubar/src/about_dialog.dart

@@ -32,18 +32,43 @@ class AboutDialog extends StatelessWidget {
           const SizedBox(height: 2),
           const ClideText(clideTagline, muted: true, fontSize: 13),
           const SizedBox(height: 16),
-          _Kv(label: 'Version', value: clideVersion, tokens: tokens),
-          _Kv(label: 'Commit', value: clideCommit, tokens: tokens),
-          _Kv(label: 'Built', value: _formatDate(clideDate), tokens: tokens),
-          _Kv(label: 'Repository', value: clideRepository, tokens: tokens),
+          _Kv(
+            label: ClideSettings.i18n.string(context, 'about.version', namespace: 'builtin.menubar', placeholder: 'Version'),
+            value: clideVersion,
+            tokens: tokens,
+          ),
+          _Kv(
+            label: ClideSettings.i18n.string(context, 'about.commit', namespace: 'builtin.menubar', placeholder: 'Commit'),
+            value: clideCommit,
+            tokens: tokens,
+          ),
+          _Kv(
+            label: ClideSettings.i18n.string(context, 'about.built', namespace: 'builtin.menubar', placeholder: 'Built'),
+            value: _formatDate(clideDate),
+            tokens: tokens,
+          ),
+          _Kv(
+            label: ClideSettings.i18n.string(context, 'about.repository', namespace: 'builtin.menubar', placeholder: 'Repository'),
+            value: clideRepository,
+            tokens: tokens,
+          ),
           const SizedBox(height: 16),
-          ClideText('Bundled dependencies', fontSize: clideFontCaption, color: tokens.globalTextMuted),
+          ClideText(
+            ClideSettings.i18n.string(context, 'licenses.heading', namespace: 'builtin.menubar', placeholder: 'Bundled dependencies'),
+            fontSize: clideFontCaption,
+            color: tokens.globalTextMuted,
+          ),
           const SizedBox(height: 6),
           _Licenses(tokens: tokens),
           const SizedBox(height: 16),
           Row(
             mainAxisAlignment: MainAxisAlignment.end,
-            children: [ClideButton(label: 'Close', onPressed: onDismiss)],
+            children: [
+              ClideButton(
+                label: ClideSettings.i18n.string(context, 'button.close', namespace: 'builtin.menubar', placeholder: 'Close'),
+                onPressed: onDismiss,
+              ),
+            ],
           ),
         ],
       ),
@@ -86,7 +111,13 @@ class _Licenses extends StatelessWidget {
       future: loadLicenses(),
       builder: (context, snap) {
         if (!snap.hasData) {
-          return ClideText(snap.hasError ? 'Licenses unavailable.' : 'Loading…', fontSize: 12, color: tokens.globalTextMuted);
+          return ClideText(
+            snap.hasError
+                ? ClideSettings.i18n.string(context, 'licenses.unavailable', namespace: 'builtin.menubar', placeholder: 'Licenses unavailable.')
+                : ClideSettings.i18n.string(context, 'licenses.loading', namespace: 'builtin.menubar', placeholder: 'Loading…'),
+            fontSize: 12,
+            color: tokens.globalTextMuted,
+          );
         }
         final deps = snap.data!.dependencies;
         return Container(

lib/builtin/menubar/src/file_actions.dart

@@ -123,9 +123,17 @@ class _OpenFolderDialogState extends State<OpenFolderDialog> {
         mainAxisSize: MainAxisSize.min,
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
-          const ClideText('Open project', fontSize: 16, fontWeight: FontWeight.w600),
+          ClideText(
+            ClideSettings.i18n.string(context, 'dialog.openProject.title', namespace: 'builtin.menubar', placeholder: 'Open project'),
+            fontSize: 16,
+            fontWeight: FontWeight.w600,
+          ),
           const SizedBox(height: 4),
-          const ClideText('Enter the path to a git repository.', muted: true, fontSize: 13),
+          ClideText(
+            ClideSettings.i18n.string(context, 'dialog.openProject.body', namespace: 'builtin.menubar', placeholder: 'Enter the path to a git repository.'),
+            muted: true,
+            fontSize: 13,
+          ),
           const SizedBox(height: 16),
           Container(
             padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 6),
@@ -148,14 +156,29 @@ class _OpenFolderDialogState extends State<OpenFolderDialog> {
               onSubmitted: (_) => unawaited(_submit()),
             ),
           ),
-          if (_error != null) ...[const SizedBox(height: 8), ClideText(_error!, color: tokens.statusError, fontSize: 12)],
+          if (_error != null) ...[
+            const SizedBox(height: 8),
+            ClideText(
+              ClideSettings.i18n.string(context, 'dialog.openProject.error', namespace: 'builtin.menubar', placeholder: 'Not a git repository'),
+              color: tokens.statusError,
+              fontSize: 12,
+            ),
+          ],
           const SizedBox(height: 16),
           Row(
             mainAxisAlignment: MainAxisAlignment.end,
             children: [
-              ClideButton(label: 'Cancel', onPressed: widget.onCancel),
+              ClideButton(
+                label: ClideSettings.i18n.string(context, 'button.cancel', namespace: 'builtin.menubar', placeholder: 'Cancel'),
+                onPressed: widget.onCancel,
+              ),
               const SizedBox(width: 8),
-              ClideButton(label: _loading ? 'Opening…' : 'Open', onPressed: _loading ? null : _submit),
+              ClideButton(
+                label: _loading
+                    ? ClideSettings.i18n.string(context, 'button.opening', namespace: 'builtin.menubar', placeholder: 'Opening…')
+                    : ClideSettings.i18n.string(context, 'button.open', namespace: 'builtin.menubar', placeholder: 'Open'),
+                onPressed: _loading ? null : _submit,
+              ),
             ],
           ),
         ],
@@ -186,15 +209,33 @@ class NotARepoDialog extends StatelessWidget {
         mainAxisSize: MainAxisSize.min,
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
-          const ClideText('No git repo found', fontSize: 16, fontWeight: FontWeight.w600),
+          ClideText(
+            ClideSettings.i18n.string(context, 'dialog.notRepo.title', namespace: 'builtin.menubar', placeholder: 'No git repo found'),
+            fontSize: 16,
+            fontWeight: FontWeight.w600,
+          ),
           const SizedBox(height: 8),
           ClideText(path, muted: true, fontSize: 13),
           const SizedBox(height: 8),
-          const ClideText('A clide project root requires a git repository.', muted: true, fontSize: 13),
+          ClideText(
+            ClideSettings.i18n.string(
+              context,
+              'dialog.notRepo.body',
+              namespace: 'builtin.menubar',
+              placeholder: 'A clide project root requires a git repository.',
+            ),
+            muted: true,
+            fontSize: 13,
+          ),
           const SizedBox(height: 16),
           Row(
             mainAxisAlignment: MainAxisAlignment.end,
-            children: [ClideButton(label: 'OK', onPressed: () => onDismiss())],
+            children: [
+              ClideButton(
+                label: ClideSettings.i18n.string(context, 'button.ok', namespace: 'builtin.menubar', placeholder: 'OK'),
+                onPressed: () => onDismiss(),
+              ),
+            ],
           ),
         ],
       ),

lib/builtin/menubar/src/menu_bar.dart

@@ -187,10 +187,24 @@ class _TopMenuButtonState extends State<_TopMenuButton> {
             alignment: Alignment.center,
             padding: const EdgeInsets.symmetric(horizontal: clideInsetStandard),
             color: open || hovered ? tokens.listItemHoverBackground : null,
-            child: ClideText(widget.menu.title, fontSize: 12, color: open || hovered ? tokens.globalForeground : tokens.chromeForeground),
+            child: ClideText(_menuTitle(ctx, widget.menu.title), fontSize: 12, color: open || hovered ? tokens.globalForeground : tokens.chromeForeground),
           ),
         ),
       ),
     );
   }
+
+  /// Localize a curated top-menu title. The curated tree authors English
+  /// titles ('File'/'View'/'Help'); resolve each to its catalog entry, falling
+  /// back to the authored English (which also drives the Alt mnemonic).
+  String _menuTitle(BuildContext context, String title) {
+    final key = switch (title) {
+      'File' => 'menu.file',
+      'View' => 'menu.view',
+      'Help' => 'menu.help',
+      _ => null,
+    };
+    if (key == null) return title;
+    return ClideSettings.i18n.string(context, key, namespace: 'builtin.menubar', placeholder: title);
+  }
 }