feat: RTL/i18n, AI translate+undo, no-refresh saves, settings perf

- RTL: force dir=rtl on LabelFilter, NotesViewToggle, LabelManagementDialog
- i18n: add missing keys (notifications, privacy, edit/preview, AI translate/undo)
- Settings pages: convert to Server Components (general, appearance) + loading skeleton
- AI menu: add Translate option (10 languages) + Undo AI button in toolbar
- Fix: saveInline uses REST API instead of Server Action → eliminates all implicit refreshes in list mode
- Fix: NotesTabsView notes sync effect preserves selected note on content changes
- Fix: auto-tag suggestions now filter already-assigned labels
- Fix: color change in card view uses local state (no refresh)
- Fix: nav links use <Link> for prefetching (Settings, Admin)
- Fix: suppress duplicate label suggestions already on note
- Route: add /api/ai/translate endpoint

keep-notes/components/providers-wrapper.tsx

@@ -5,6 +5,7 @@ import { LabelProvider } from '@/context/LabelContext'
 import { NotebooksProvider } from '@/context/notebooks-context'
 import { NotebookDragProvider } from '@/context/notebook-drag-context'
 import { NoteRefreshProvider } from '@/context/NoteRefreshContext'
+import { HomeViewProvider } from '@/context/home-view-context'
 import type { ReactNode } from 'react'
 
 interface ProvidersWrapperProps {
@@ -19,7 +20,7 @@ export function ProvidersWrapper({ children, initialLanguage = 'en' }: Providers
         <NotebooksProvider>
           <NotebookDragProvider>
             <LanguageProvider initialLanguage={initialLanguage as any}>
-              {children}
+              <HomeViewProvider>{children}</HomeViewProvider>
             </LanguageProvider>
           </NotebookDragProvider>
         </NotebooksProvider>