feat: worklist sorting, contextual disposition, context panel redesign, notifications

- Worklist default sort descending (newest first), sortable column headers (PRIORITY, PATIENT, SLA) via React Aria
- Contextual disposition: auto-selects based on in-call actions (appointment → APPOINTMENT_BOOKED, enquiry → INFO_PROVIDED, transfer → FOLLOW_UP_SCHEDULED)
- Context panel redesign: collapsible AI Insight, Upcoming (appointments + follow-ups + linked patient), Recent (calls + activities) sections; auto-collapse on AI chat start
- Appointments added to DataProvider with APPOINTMENTS_QUERY, Appointment type, transform
- Notification bell for admin/supervisor: performance alerts (idle time, NPS, conversion thresholds) with toast on load + bell dropdown with dismiss; demo alerts as fallback
- Slideout z-index fix: added z-50 to slideout ModalOverlay matching modal component

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

src/types/entities.ts

@@ -294,6 +294,27 @@ export type Patient = {
     patientType: PatientType | null;
 };
 
+// Appointment domain
+export type AppointmentStatus = 'SCHEDULED' | 'CONFIRMED' | 'CHECKED_IN' | 'IN_PROGRESS' | 'COMPLETED' | 'CANCELLED' | 'NO_SHOW';
+export type AppointmentType = 'CONSULTATION' | 'FOLLOW_UP' | 'PROCEDURE' | 'EMERGENCY';
+
+export type Appointment = {
+    id: string;
+    createdAt: string | null;
+    scheduledAt: string | null;
+    durationMinutes: number | null;
+    appointmentType: AppointmentType | null;
+    appointmentStatus: AppointmentStatus | null;
+    doctorName: string | null;
+    doctorId: string | null;
+    department: string | null;
+    reasonForVisit: string | null;
+    patientId: string | null;
+    patientName: string | null;
+    patientPhone: string | null;
+    clinicName: string | null;
+};
+
 // Lead Ingestion Source domain
 export type IntegrationStatus = 'ACTIVE' | 'WARNING' | 'ERROR' | 'DISABLED';
 export type AuthStatus = 'VALID' | 'EXPIRING_SOON' | 'EXPIRED' | 'NOT_CONFIGURED';