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/session/sidebar/SidebarProjectsList.tsx

@@ -15,6 +15,7 @@ import type { SessionGroup } from './types';
 import type { SortableDragHandleProps } from './sortableItems';
 import { SortableGroupItem, SortableProjectItem } from './sortableItems';
 import { formatProjectLabel } from './utils';
+import { useI18n } from '@/lib/i18n';
 
 type ProjectSection = {
   project: {
@@ -64,6 +65,7 @@ type Props = {
 };
 
 export function SidebarProjectsList(props: Props): React.ReactNode {
+  const { t } = useI18n();
   const projectSensors = useSensors(
     useSensor(PointerSensor, { activationConstraint: { distance: 8 } }),
     useSensor(KeyboardSensor, { coordinateGetter: sortableKeyboardCoordinates }),
@@ -96,7 +98,7 @@ export function SidebarProjectsList(props: Props): React.ReactNode {
               ?? activeSection.groups.find((candidate) => candidate.isMain)
               ?? activeSection.groups[0];
             if (!primaryGroup) {
-              return <div className="py-1 text-left typography-micro text-muted-foreground">No sessions yet.</div>;
+              return <div className="py-1 text-left typography-micro text-muted-foreground">{t('sessions.sidebar.empty.noSessions.title')}</div>;
             }
             const archivedGroup = activeSection.groups.find((candidate) => candidate.isArchivedBucket);
             const groupsToRender = [
@@ -222,7 +224,7 @@ export function SidebarProjectsList(props: Props): React.ReactNode {
                             <DragOverlay dropAnimation={null} />
                           </DndContext>
                         ) : (
-                          <div className="py-1 text-left typography-micro text-muted-foreground">No sessions yet.</div>
+                          <div className="py-1 text-left typography-micro text-muted-foreground">{t('sessions.sidebar.empty.noSessions.title')}</div>
                         )}
                       </div>
                     ) : null}