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/message/TextSelectionMenu.tsx

@@ -14,6 +14,7 @@ import { resolveProjectForSessionDirectory } from '@/lib/projectResolution';
 import { useEffectiveDirectory } from '@/hooks/useEffectiveDirectory';
 import { summarizeText } from '@/lib/voice/summarize';
 import { isVSCodeRuntime } from '@/lib/desktop';
+import { useI18n } from '@/lib/i18n';
 
 interface TextSelectionMenuProps {
   containerRef: React.RefObject<HTMLElement | null>;
@@ -206,6 +207,7 @@ const rangeToMarkdown = (range: Range, plainText: string): string => {
 };
 
 export const TextSelectionMenu: React.FC<TextSelectionMenuProps> = ({ containerRef }) => {
+  const { t } = useI18n();
   const [position, setPosition] = React.useState<MenuPosition>({ x: 0, y: 0, show: false });
   const [selectedText, setSelectedText] = React.useState('');
   const [selectedTextMarkdown, setSelectedTextMarkdown] = React.useState('');
@@ -498,7 +500,7 @@ export const TextSelectionMenu: React.FC<TextSelectionMenuProps> = ({ containerR
   const handleAddToNotes = React.useCallback(async () => {
     if (!selectedText || !currentProjectRef) {
       if (!currentProjectRef) {
-        toast.error('No project found for this session');
+        toast.error(t('chat.textSelection.toast.noProject'));
       }
       return;
     }
@@ -517,18 +519,18 @@ export const TextSelectionMenu: React.FC<TextSelectionMenuProps> = ({ containerR
         todos: projectData.todos,
       });
       if (!saved) {
-        toast.error('Failed to add to notes');
+        toast.error(t('chat.textSelection.toast.addToNotesFailed'));
         return;
       }
       window.dispatchEvent(new CustomEvent('openchamber:project-notes-updated', {
         detail: { projectId: currentProjectRef.id },
       }));
-      toast.success('Added distilled insight to notes');
+      toast.success(t('chat.textSelection.toast.addToNotesSuccess'));
       hideMenu();
       window.getSelection()?.removeAllRanges();
     } catch (error) {
       const description = error instanceof Error ? error.message : undefined;
-      toast.error('Failed to add to notes', description ? { description } : undefined);
+      toast.error(t('chat.textSelection.toast.addToNotesFailed'), description ? { description } : undefined);
     } finally {
       setIsAddingToNotes(false);
     }
@@ -566,7 +568,7 @@ export const TextSelectionMenu: React.FC<TextSelectionMenuProps> = ({ containerR
           type="button"
         >
           <RiAddLine className="h-5 w-5" />
-          <span>Add to chat</span>
+          <span>{t('chat.textSelection.actions.addToChat')}</span>
         </button>
         
         <button
@@ -581,7 +583,7 @@ export const TextSelectionMenu: React.FC<TextSelectionMenuProps> = ({ containerR
           type="button"
         >
           <RiChatNewLine className="h-5 w-5" />
-          <span>New session</span>
+          <span>{t('chat.textSelection.actions.newSession')}</span>
         </button>
         
         <button
@@ -596,7 +598,7 @@ export const TextSelectionMenu: React.FC<TextSelectionMenuProps> = ({ containerR
           type="button"
         >
           <RiFileCopyLine className="h-5 w-5" />
-          <span>Copy</span>
+          <span>{t('chat.textSelection.actions.copy')}</span>
         </button>
 
         {!isVSCodeRuntime() ? (
@@ -613,7 +615,7 @@ export const TextSelectionMenu: React.FC<TextSelectionMenuProps> = ({ containerR
             type="button"
           >
             {isAddingToNotes ? <RiLoader4Line className="h-5 w-5 animate-spin" /> : <RiBookletLine className="h-5 w-5" />}
-            <span>Add to notes</span>
+            <span>{t('chat.textSelection.actions.addToNotes')}</span>
           </button>
         ) : null}
       </div>,
@@ -651,11 +653,11 @@ export const TextSelectionMenu: React.FC<TextSelectionMenuProps> = ({ containerR
             'hover:bg-[var(--interactive-hover)]',
             'transition-colors duration-150'
           )}
-          title="Add to current chat"
+          title={t('chat.textSelection.title.addToCurrentChat')}
           type="button"
         >
           <RiAddLine className="h-4 w-4" />
-          <span className="whitespace-nowrap">Add to chat</span>
+          <span className="whitespace-nowrap">{t('chat.textSelection.actions.addToChat')}</span>
         </button>
       
         <div className="w-px h-4 bg-[var(--interactive-border)]" />
@@ -669,11 +671,11 @@ export const TextSelectionMenu: React.FC<TextSelectionMenuProps> = ({ containerR
             'hover:bg-[var(--interactive-hover)]',
             'transition-colors duration-150'
           )}
-          title="Create new session with selection"
+          title={t('chat.textSelection.title.newSessionWithSelection')}
           type="button"
         >
           <RiChatNewLine className="h-4 w-4" />
-          <span className="whitespace-nowrap">New session</span>
+          <span className="whitespace-nowrap">{t('chat.textSelection.actions.newSession')}</span>
         </button>
 
         {!isVSCodeRuntime() ? (
@@ -690,11 +692,11 @@ export const TextSelectionMenu: React.FC<TextSelectionMenuProps> = ({ containerR
                 'hover:bg-[var(--interactive-hover)] disabled:opacity-60 disabled:cursor-not-allowed',
                 'transition-colors duration-150'
               )}
-              title="Save distilled insight to notes"
+              title={t('chat.textSelection.title.saveInsightToNotes')}
               type="button"
             >
               {isAddingToNotes ? <RiLoader4Line className="h-4 w-4 animate-spin" /> : <RiBookletLine className="h-4 w-4" />}
-              <span className="whitespace-nowrap">Add to notes</span>
+              <span className="whitespace-nowrap">{t('chat.textSelection.actions.addToNotes')}</span>
             </button>
           </>
         ) : null}