feat: add Ressourcen timeline view with group ordering (alpha.14)

- New timeline page showing all groups and active events in parallel
- Group order API endpoints with persistence (GET/POST /api/groups/order)
- Customizable group ordering with visual controls
- Fix CSS and TypeScript lint errors
- Update documentation and bump version to 2026.1.0-alpha.14

README.md

@@ -330,6 +330,8 @@ mosquitto_sub -h localhost -t "infoscreen/+/heartbeat" -v
 - `GET /api/clients` - List all registered clients
 - `PUT /api/clients/{uuid}/group` - Assign client to group
 - `GET /api/groups` - List client groups with alive status
+- `GET /api/groups/order` - Get saved group display order
+- `POST /api/groups/order` - Save group display order (array of group IDs)
 - `GET /api/events` - List events with filtering
 - `POST /api/events` - Create new event
 - `POST /api/events/{id}/occurrences/{date}/detach` - Detach single occurrence from recurring series
@@ -434,6 +436,14 @@ mosquitto_sub -h localhost -t "infoscreen/+/heartbeat" -v
    - 🗓️ Events (admin+): WebUntis/Vertretungsplan URL enable/disable, save, preview. Presentations: general defaults for slideshow interval, page-progress, and auto-progress; persisted via `/api/system-settings` keys and applied on create in the event modal. Videos: system-wide defaults for `autoplay`, `loop`, `volume`, and `muted`; persisted via `/api/system-settings` keys and applied on create in the event modal.
    - ⚙️ System (superadmin): Organization info and Advanced configuration placeholders
 - **Holidays**: Academic calendar management
+- **Ressourcen**: Timeline view of active events across all room groups
+   - Parallel timeline display showing all groups and their current events simultaneously
+   - Compact visualization: 65px row height per group with color-coded event bars
+   - Day and week views for flexible time range inspection
+   - Customizable group ordering with visual drag controls (order persisted to backend)
+   - Real-time event status: shows currently running events with type, title, and time window
+   - Filters out unassigned groups for focused view
+   - Resource-based Syncfusion timeline scheduler with resize and drag-drop support
  - **Program info**: Version, build info, tech stack and paginated changelog (reads `dashboard/public/program-info.json`)
 
 ## 🔒 Security & Authentication