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/chat/ChatEmptyState.tsx

@@ -2,8 +2,10 @@ import React from 'react';
 import { OpenChamberLogo } from '@/components/ui/OpenChamberLogo';
 import { useThemeSystem } from '@/contexts/useThemeSystem';
 import { useGlobalSyncStore } from '@/sync/global-sync-store';
+import { useI18n } from '@/lib/i18n';
 
 const ChatEmptyState: React.FC = () => {
+    const { t } = useI18n();
     const { currentTheme } = useThemeSystem();
     const initError = useGlobalSyncStore((s) => s.error);
 
@@ -14,13 +16,13 @@ const ChatEmptyState: React.FC = () => {
             <OpenChamberLogo width={140} height={140} className="opacity-20" />
             {initError ? (
                 <div className="flex flex-col items-center gap-2 max-w-md text-center px-4">
-                    <span className="text-body-md font-medium text-destructive">OpenCode is not reachable</span>
+                    <span className="text-body-md font-medium text-destructive">{t('chat.emptyState.opencodeUnreachable')}</span>
                     <span className="text-body-sm" style={{ color: textColor }}>
                         {initError.message}
                     </span>
                 </div>
             ) : (
-                <span className="text-body-md" style={{ color: textColor }}>Start a new chat</span>
+                <span className="text-body-md" style={{ color: textColor }}>{t('chat.emptyState.startNewChat')}</span>
             )}
         </div>
     );