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

_bmad-output/planning-artifacts/prd-ai-innovations.md

@@ -0,0 +1,21 @@
+---
+stepsCompleted: [step-01-init]
+inputDocuments:
+  - _bmad-output/brainstorming/brainstorming-session-2026-04-13-133700.md
+  - _bmad-output/planning-artifacts/project-context.md
+  - _bmad-output/planning-artifacts/prd.md
+  - docs/project-overview.md
+workflowType: 'prd'
+documentCounts:
+  brainstorming: 1
+  projectContext: 1
+  existingPrd: 1
+  projectDocs: 1
+  briefs: 0
+  research: 0
+---
+
+# Product Requirements Document - Keep
+
+**Author:** Ramez
+**Date:** 2026-04-13