Localize macOS application menu and correct AITURK package checks

apps/desktop/src/i18n/context.test.tsx

@@ -30,6 +30,42 @@ describe('I18nProvider', () => {
     vi.restoreAllMocks()
   })
 
+  it('keeps the native menu aligned with loaded, optimistic and rolled-back language', async () => {
+    const original = window.hermesDesktop
+    const setUiLanguage = vi.fn()
+    window.hermesDesktop = { ...original, setUiLanguage }
+    let rejectSave: (error: Error) => void = () => undefined
+
+    const configClient: I18nConfigClient = {
+      getConfig: vi.fn().mockResolvedValue({ display: { language: 'en' } }),
+      saveConfig: vi.fn().mockImplementation(
+        () =>
+          new Promise((_resolve, reject) => {
+            rejectSave = reject
+          })
+      )
+    }
+
+    try {
+      render(
+        <I18nProvider configClient={configClient}>
+          <LanguageProbe target="tr" />
+        </I18nProvider>
+      )
+      await waitFor(() => expect(setUiLanguage).toHaveBeenLastCalledWith('en'))
+      fireEvent.click(screen.getByRole('button', { name: 'switch' }))
+      await waitFor(() => expect(configClient.saveConfig).toHaveBeenCalledTimes(1))
+      expect(setUiLanguage).toHaveBeenLastCalledWith('tr')
+      rejectSave(new Error('Cannot save language'))
+      await waitFor(() => expect(screen.getByTestId('save-error').textContent).toBe('Cannot save language'))
+      expect(setUiLanguage).toHaveBeenLastCalledWith('en')
+      expect(screen.getByTestId('locale').textContent).toBe('en')
+    } finally {
+      cleanup()
+      window.hermesDesktop = original
+    }
+  })
+
   it('defaults to Turkish without a config client', () => {
     render(
       <I18nProvider configClient={null}>

apps/desktop/src/i18n/context.tsx

@@ -105,6 +105,10 @@ export function I18nProvider({ children, configClient = defaultConfigClient, ini
     localeRef.current = locale
     setRuntimeI18nLocale(locale)
     applyDocumentLocale(locale)
+
+    if (typeof window !== 'undefined') {
+      window.hermesDesktop?.setUiLanguage?.(locale)
+    }
   }, [locale])
 
   useEffect(() => {