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/MultiRunWindow.tsx

@@ -3,6 +3,7 @@ import { Dialog } from '@base-ui/react/dialog';
 import { RiCloseLine } from '@remixicon/react';
 import { cn } from '@/lib/utils';
 import { MultiRunLauncher } from '@/components/multirun';
+import { useI18n } from '@/lib/i18n';
 
 interface MultiRunWindowProps {
   open: boolean;
@@ -16,6 +17,7 @@ export const MultiRunWindow: React.FC<MultiRunWindowProps> = ({
   initialPrompt,
 }) => {
   const descriptionId = React.useId();
+  const { t } = useI18n();
 
   const hasOpenFloatingMenu = React.useCallback(() => {
     if (typeof document === 'undefined') {
@@ -50,14 +52,14 @@ export const MultiRunWindow: React.FC<MultiRunWindowProps> = ({
             <button
               type="button"
               onClick={() => onOpenChange(false)}
-              aria-label="Close multi-run"
+              aria-label={t('multiRun.window.actions.closeAria')}
               className="inline-flex h-7 w-7 items-center justify-center rounded-md p-0.5 text-muted-foreground hover:text-foreground hover:bg-interactive-hover/50 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary"
             >
               <RiCloseLine className="h-5 w-5" />
             </button>
           </div>
           <Dialog.Description id={descriptionId} className="sr-only">
-            OpenChamber Multi-Run window.
+            {t('multiRun.window.description')}
           </Dialog.Description>
           <MultiRunLauncher
             initialPrompt={initialPrompt}