Add i18n foundation and translations (#1027)

* feat: add i18n foundation

* feat: localize sessions sidebar

* Localize multirun/scheduled tasks and fix dialog dropdown interactions

* localize git sidebar surface and add zh-CN keys

* feat(ui): localize context panel, diff/plan views, and context sidebar content

* fix(config): resolve user config home via fs/home before embedded home

* localize header/chat UI and complete model/worktree panel strings

* localize worktree + github issue/pr dialog flows

* localize settings sections and split settings i18n dictionaries

* localize additional settings sections and sidebars

* localize more settings pages and dialogs

* fix settings select trigger localization

* localize tunnel settings ui surface

* localize additional settings sections

* localize keyboard shortcuts labels in settings

* localize terminal and utility dialogs surfaces

* feat(i18n): localize remaining UI strings

* Add Ukrainian locale

* Add Spanish locale

* Add Brazilian Portuguese locale

* Polish locale translations

packages/ui/src/components/views/SettingsWindow.tsx

@@ -1,6 +1,7 @@
 import React from 'react';
 import { Dialog } from '@base-ui/react/dialog';
 import { cn } from '@/lib/utils';
+import { useI18n } from '@/lib/i18n';
 import { SettingsView } from './SettingsView';
 
 interface SettingsWindowProps {
@@ -13,6 +14,7 @@ interface SettingsWindowProps {
  * Used for desktop and web (non-mobile) environments.
  */
 export const SettingsWindow: React.FC<SettingsWindowProps> = ({ open, onOpenChange }) => {
+  const { t } = useI18n();
   const descriptionId = React.useId();
 
   const hasOpenFloatingMenu = React.useCallback(() => {
@@ -45,7 +47,7 @@ export const SettingsWindow: React.FC<SettingsWindowProps> = ({ open, onOpenChan
           )}
         >
           <Dialog.Description id={descriptionId} className="sr-only">
-            OpenChamber settings window.
+            {t('settings.window.description')}
           </Dialog.Description>
           <SettingsView onClose={() => onOpenChange(false)} isWindowed />
         </Dialog.Popup>