feat: AIUI chat mode integration with iframe, context broker, overnight loop

- Chat mode: AIUI loads in sandboxed iframe at /dashboard/chat with transparent bg
- Mode switcher: Easy + Pro tabs only, Chat is a launcher button
- Keyboard shortcuts: Cmd+1 (Easy), Cmd+2 (Pro), Cmd+3 (Chat), Cmd+M (cycle)
- Directional transitions: chat slides from/to left, dashboard from/to right
- Context broker: postMessage protocol for quarantined AIUI communication
- AI permissions store: user-controlled toggles for data access categories
- Settings UI: AI Data Access section with per-category toggles
- AIUI container manifest and nginx proxy config for /aiui/
- Deploy script builds AIUI with /aiui/ base path
- Overnight loop infrastructure (loop.sh, prepare.sh, plan.md, prompt.md)
- Security hooks for autonomous overnight runs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

neode-ui/package.json

@@ -7,7 +7,7 @@
     "start": "./start-dev.sh",
     "stop": "./stop-dev.sh",
     "dev": "vite",
-    "dev:mock": "concurrently \"node mock-backend.js\" \"vite\"",
+    "dev:mock": "concurrently \"node mock-backend.js\" \"VITE_AIUI_URL=http://localhost:5173 vite\" \"cd ../../AIUI && pnpm dev 2>/dev/null || echo '[AIUI] Not found at ../../AIUI — chat will show placeholder'\"",
     "dev:real": "echo 'Start backend: cd ../core && cargo run --release' && vite",
     "backend:mock": "node mock-backend.js",
     "backend:real": "cd ../core && cargo run --release",