feat: send disposition to sidecar with UCID for Ozonetel ACW release

- Store UCID from outbound dial API response in sipCallUcidAtom
- Replace direct createCall GraphQL mutation with sidecar /api/ozonetel/dispose
- Remove agent-ready call from handleReset (no longer needed)
- Clear UCID on dial error and call reset

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

src/components/call-desk/click-to-call-button.tsx

@@ -3,7 +3,9 @@ import { Phone01 } from '@untitledui/icons';
 import { useSetAtom } from 'jotai';
 import { Button } from '@/components/base/buttons/button';
 import { useSip } from '@/providers/sip-provider';
-import { sipCallStateAtom, sipCallerNumberAtom } from '@/state/sip-state';
+import { sipCallStateAtom, sipCallerNumberAtom, sipCallUcidAtom } from '@/state/sip-state';
+import { setOutboundPending } from '@/state/sip-manager';
+import { apiClient } from '@/lib/api-client';
 import { notify } from '@/lib/toast';
 
 interface ClickToCallButtonProps {
@@ -14,10 +16,11 @@ interface ClickToCallButtonProps {
 }
 
 export const ClickToCallButton = ({ phoneNumber, label, size = 'sm' }: ClickToCallButtonProps) => {
-    const { isRegistered, isInCall, makeCall } = useSip();
+    const { isRegistered, isInCall } = useSip();
     const [dialing, setDialing] = useState(false);
     const setCallState = useSetAtom(sipCallStateAtom);
     const setCallerNumber = useSetAtom(sipCallerNumberAtom);
+    const setCallUcid = useSetAtom(sipCallUcidAtom);
 
     const handleDial = async () => {
         setDialing(true);
@@ -25,13 +28,21 @@ export const ClickToCallButton = ({ phoneNumber, label, size = 'sm' }: ClickToCa
         // Show call UI immediately
         setCallState('ringing-out');
         setCallerNumber(phoneNumber);
+        setOutboundPending(true);
+        // Safety: reset flag if SIP INVITE doesn't arrive within 30s
+        const safetyTimer = setTimeout(() => setOutboundPending(false), 30000);
 
         try {
-            // Direct SIP call from browser
-            makeCall(phoneNumber);
+            const result = await apiClient.post<{ ucid?: string; status?: string }>('/api/ozonetel/dial', { phoneNumber });
+            if (result?.ucid) {
+                setCallUcid(result.ucid);
+            }
         } catch {
+            clearTimeout(safetyTimer);
             setCallState('idle');
             setCallerNumber(null);
+            setOutboundPending(false);
+            setCallUcid(null);
             notify.error('Dial Failed', 'Could not place the call');
         } finally {
             setDialing(false);