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/lib/queries.ts

@@ -66,6 +66,14 @@ export const DOCTORS_QUERY = `{ doctors(first: 20) { edges { node {
     clinic { id name clinicName }
 } } } }`;
 
+export const APPOINTMENTS_QUERY = `{ appointments(first: 100, orderBy: [{ scheduledAt: DescNullsLast }]) { edges { node {
+    id name createdAt
+    scheduledAt durationMin appointmentType status
+    doctorName department reasonForVisit
+    patient { id fullName { firstName lastName } phones { primaryPhoneNumber } }
+    doctor { id clinic { clinicName } }
+} } } }`;
+
 export const PATIENTS_QUERY = `{ patients(first: 50) { edges { node {
     id name fullName { firstName lastName }
     phones { primaryPhoneNumber }