fix: unify appointment data source — single DataProvider, immediate refresh

- appointments-v2: migrated from local query/state to useData().appointments.
  Removed AppointmentRecord type, QUERY, fetchAppointments(), local useState.
  All field references updated to transformed Appointment type (appointmentStatus,
  patientName, patientPhone, clinicName, doctorId).
- active-call-card: calls refresh() after appointment book/reschedule/cancel
  so pills update immediately. Also invalidates sidecar Redis cache.
- One source of truth — all appointment consumers read from DataProvider.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/call-desk/active-call-card.tsx

@@ -71,7 +71,7 @@ export const ActiveCallCard = ({ lead, callerPhone, missedCallId, onCallComplete
     // Upcoming appointments for this caller (if returning patient) — drives
     // the pill row above AppointmentForm so the agent can edit existing
     // bookings in addition to creating new ones.
-    const { appointments } = useData();
+    const { appointments, refresh } = useData();
     const leadAppointments = useMemo(() => {
         const patientId = (lead as any)?.patientId;
         if (!patientId) return [];
@@ -180,6 +180,11 @@ export const ActiveCallCard = ({ lead, callerPhone, missedCallId, onCallComplete
 
     const handleAppointmentSaved = (outcome: 'BOOKED' | 'RESCHEDULED' | 'CANCELLED') => {
         setAppointmentOpen(false);
+        refresh();
+        // Invalidate sidecar's caller context cache so AI gets fresh appointment data
+        if (lead?.id) {
+            apiClient.post('/api/caller/invalidate-context', { leadId: lead.id }, { silent: true }).catch(() => {});
+        }
         if (outcome === 'RESCHEDULED') {
             addActions('RESCHEDULE');
             notify.success('Appointment Rescheduled');