feat(agenda): Epic 1 - Calendar views with FullCalendar

- E1.S1: FullCalendar setup with React wrapper
- E1.S2: Day view (timeGridDay) with hourly slots
- E1.S3: Week view (timeGridWeek) with 7-day grid
- E1.S4: Workweek view (timeGridWorkWeek, Mon-Fri)

Features:
- View switcher toolbar (Dag/Week/Werkweek)
- Date navigation (prev/next/today)
- Dutch localization (nl)
- Business hours highlighting (08:00-18:00)
- Color-coded appointments by type
- Drag-and-drop rescheduling support
- Server actions for encounter CRUD

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

package.json

@@ -13,6 +13,11 @@
   },
   "dependencies": {
     "@deepgram/sdk": "^4.11.2",
+    "@fullcalendar/core": "^6.1.19",
+    "@fullcalendar/daygrid": "^6.1.19",
+    "@fullcalendar/interaction": "^6.1.19",
+    "@fullcalendar/react": "^6.1.19",
+    "@fullcalendar/timegrid": "^6.1.19",
     "@hookform/resolvers": "^5.2.2",
     "@radix-ui/react-dialog": "^1.1.15",
     "@radix-ui/react-dropdown-menu": "^2.1.16",