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/prisma/client-generated/wasm.js

@@ -275,6 +275,7 @@ exports.Prisma.UserAISettingsScalarFieldEnum = {
   fontSize: 'fontSize',
   demoMode: 'demoMode',
   showRecentNotes: 'showRecentNotes',
+  notesViewMode: 'notesViewMode',
   emailNotifications: 'emailNotifications',
   desktopNotifications: 'desktopNotifications',
   anonymousAnalytics: 'anonymousAnalytics'