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/components/call-desk/phone-action-cell.tsx

@@ -9,9 +9,10 @@ type PhoneActionCellProps = {
     phoneNumber: string;
     displayNumber: string;
     leadId?: string;
+    onDial?: () => void;
 };
 
-export const PhoneActionCell = ({ phoneNumber, displayNumber, leadId: _leadId }: PhoneActionCellProps) => {
+export const PhoneActionCell = ({ phoneNumber, displayNumber, leadId: _leadId, onDial }: PhoneActionCellProps) => {
     const { isRegistered, isInCall, dialOutbound } = useSip();
     const [menuOpen, setMenuOpen] = useState(false);
     const [dialing, setDialing] = useState(false);
@@ -35,6 +36,7 @@ export const PhoneActionCell = ({ phoneNumber, displayNumber, leadId: _leadId }:
         setMenuOpen(false);
         setDialing(true);
         try {
+            onDial?.();
             await dialOutbound(phoneNumber);
         } catch {
             notify.error('Dial Failed', 'Could not place the call');