fix: Book Appt pills + AI chat clears on call end

Book Appt defect (QA-559): no visible path to edit an existing
appointment — the Upcoming section in the context panel collapses
automatically when the AI auto-summary fires, hiding the Edit action.

Fix: render appointment pills above the AppointmentForm drawer when
the returning patient has upcoming appointments:
  [+ New]  [Apr 24 · Dr. Harpreet  Edit]  [May 02 · Dr. Meena  Edit]
- Click [+ New] (default): empty form, create mode
- Click Edit on a pill: form prefills with that appointment, edit mode
- Closing the drawer resets the selected pill

Separate defect: AI chat persisted after call ended — stale summary
from the previous call stayed visible on the worklist. ai-chat-panel
now wipes messages + resets the auto-fire guard when
callerContext.leadId transitions to null (call dropped/released, no
selected lead).

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

src/components/call-desk/ai-chat-panel.tsx

@@ -50,14 +50,26 @@ export const AiChatPanel = ({ callerContext, onChatStart }: AiChatPanelProps) =>
     }, [messages, onChatStart]);
 
     // Auto-fire a patient-summary request when a caller with a leadId appears
-    // on the panel. Resets whenever the caller changes (new incoming call) so
-    // each call starts fresh. The sidecar's AI agent inspects the leadId and
-    // replies with appointment/disposition/notes history when the caller is
-    // a returning patient, or a brief "net-new caller" ack otherwise.
+    // on the panel. Resets whenever the caller changes (new incoming call) or
+    // the call ends (leadId clears), so each call starts fresh. The sidecar's
+    // AI agent inspects the leadId and replies with appointment/disposition/
+    // notes history when the caller is a returning patient.
     const autoFiredForLeadRef = useRef<string | null>(null);
     useEffect(() => {
         const leadId = callerContext?.leadId ?? null;
-        if (!leadId) return;
+
+        // Call ended or no caller — wipe the panel so the next caller's
+        // context doesn't bleed over and the agent isn't staring at a stale
+        // summary in the worklist view between calls.
+        if (!leadId) {
+            if (autoFiredForLeadRef.current !== null) {
+                autoFiredForLeadRef.current = null;
+                setMessages([]);
+                chatStartedRef.current = false;
+            }
+            return;
+        }
+
         if (autoFiredForLeadRef.current === leadId) return;
 
         // New caller — clear any prior chat state and fire the summary prompt.