Add customizable home dashboard with per-user pinned apps

- Users can pin/unpin any available service on their home page via a
  Customize mode; preferences persisted via PATCH /api/users/me/preferences
- Time-aware greeting renders the user's display name through React JSX
  (HTML-escaped by design — no dangerouslySetInnerHTML used)
- Added dashboard_app_ids JSON column to users table (migration c7e8f9a0b1d2)
- /settings now routes to a placeholder page

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

changelog/2026-04-17_customizable-home-dashboard.md

@@ -0,0 +1,23 @@
+# 2026-04-17 — Customizable home dashboard and settings placeholder
+
+**Timestamp:** 2026-04-17T14:00:00+00:00
+
+## Summary
+
+Replaced the static dashboard page with a per-user customizable home screen. Each user can pin and unpin apps from the available services list. A time-aware greeting shows the user's display name (XSS-safe via React JSX text rendering). The Settings navigation item now routes to a placeholder page.
+
+## Files Added / Modified / Deleted
+
+### Added
+- `backend/alembic/versions/c7e8f9a0b1d2_add_dashboard_app_ids_to_users.py` — Migration adding `dashboard_app_ids` JSON column to `users` table (default `[]`; non-nullable)
+- `frontend/src/pages/SettingsPage.tsx` — Placeholder settings page at `/settings`
+
+### Modified
+- `backend/app/models/user.py` — Added `dashboard_app_ids: Mapped[list]` JSON column
+- `backend/app/schemas/user.py` — Added `DashboardPrefsOut` and `DashboardPrefsUpdate` schemas; `app_ids` validated as safe slugs (regex, max 50, max 64 chars each)
+- `backend/app/routers/users.py` — Added `GET /api/users/me/preferences` and `PATCH /api/users/me/preferences` endpoints
+- `frontend/src/api/client.ts` — Added `DashboardPrefs` interface, `getDashboardPrefs()`, `updateDashboardPrefs()`
+- `frontend/src/pages/DashboardPage.tsx` — Full rewrite: greeting, pinned app cards grid, customize/edit mode with add/remove toggles, save via TanStack Query mutation
+- `frontend/src/App.tsx` — Imported `SettingsPage`, registered `/settings` route
+- `backend/STATUS.md` — Updated Users endpoints table and models table
+- `frontend/STATUS.md` — Added home dashboard section, added `/settings` to routes table