feat(settings): add item search (#1592)

Adds item-level search inside Settings so users can find concrete settings like provider auth, agent mode, terminal font size, tunnel options, notification events, and similar controls instead of only filtering top-level pages.
Groups search results by Settings page and shows localized labels plus optional descriptions where useful.
Supports keyboard navigation with Arrow Up/Down, Enter, and Escape, matching the existing autocomplete interaction style.
Opens the correct Settings page or split-page draft state before scrolling to the matching control.
Highlights the matched setting with a subtle token-based background so users can see where they landed without an aggressive outline.
Adds explicit data-settings-item anchors across Settings pages and a centralized search registry with runtime/mobile availability guards.
Updates Settings UI skill guidance so future Settings changes keep search registry entries, anchors, localization, and availability guards in sync.

packages/ui/src/lib/i18n/messages/pl.settings.ts

@@ -1,4 +1,5 @@
 export const settingsDict = {
+  'settings.appearance.language.label': 'Język',
   'settings.appearance.language.description': 'Wybierz język interfejsu.',
   'settings.agents.modelSelector.actions.addToFavorites': 'Dodaj do ulubionych',
   'settings.agents.modelSelector.actions.favorite': 'Ulubione',
@@ -911,6 +912,8 @@ export const settingsDict = {
   'settings.openchamber.visual.field.interfaceFontSize': 'Rozmiar czcionki interfejsu',
   'settings.openchamber.visual.field.lightTheme': 'Jasny motyw',
   'settings.openchamber.visual.field.mermaidRenderingAria': 'Renderowanie Mermaid: {option}',
+  'settings.openchamber.visual.field.mobileKeyboardMode': 'Tryb klawiatury mobilnej',
+  'settings.openchamber.visual.field.mobileKeyboardModeHint': 'Wybierz sposób zachowania widoku podczas otwartej klawiatury.',
   'settings.openchamber.visual.field.persistDraftMessages': 'Zachowuj szkice wiadomości',
   'settings.openchamber.visual.field.persistDraftMessagesAria': 'Zachowuj szkice wiadomości',
   'settings.openchamber.visual.field.pwaInstallAppNameAria': 'Nazwa aplikacji instalacyjnej PWA',
@@ -1672,6 +1675,10 @@ export const settingsDict = {
   'settings.view.actions.reloadOpenCode': 'Przeładuj OpenCode',
   'settings.view.actions.reloadOpenCodeTooltip': 'Uruchom ponownie OpenCode i przeładuj jego konfigurację.',
   'settings.view.actions.resizeNavigation': 'Zmień rozmiar nawigacji',
+  'settings.view.search.placeholder': 'Szukaj ustawień',
+  'settings.view.search.aria': 'Szukaj ustawień',
+  'settings.view.search.clear': 'Wyczyść wyszukiwanie ustawień',
+  'settings.view.search.noResults': 'Brak pasujących ustawień',
   'settings.view.badge.beta': 'beta',
   'settings.view.home.cards.agents.description': 'Prompty, narzędzia, uprawnienia',
   'settings.view.home.cards.agents.title': 'Agenci',