fix: SIP disconnect on callState change + dispose sends agentId

- Fixed useEffect dependency bug: callState in deps caused cleanup
  (disconnectSip) to fire on every state transition, killing SIP
  mid-dial. Now uses useRef for callState in beforeunload handler
  with empty deps array — cleanup only fires on unmount.
- sendBeacon auto-dispose now includes agentId from agent config
- Disposition modal submit now includes agentId from agent config

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

src/components/call-desk/active-call-card.tsx

@@ -90,9 +90,11 @@ export const ActiveCallCard = ({ lead, callerPhone, missedCallId, onCallComplete
 
         // Submit disposition to sidecar
         if (callUcid) {
+            const agentCfg = JSON.parse(localStorage.getItem('helix_agent_config') ?? '{}');
             const disposePayload = {
                 ucid: callUcid,
                 disposition,
+                agentId: agentCfg.ozonetelAgentId,
                 callerPhone,
                 direction: callDirectionRef.current,
                 durationSec: callDuration,

src/providers/sip-provider.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useCallback, type PropsWithChildren } from 'react';
+import { useEffect, useCallback, useRef, type PropsWithChildren } from 'react';
 import { useAtom, useSetAtom } from 'jotai';
 import {
     sipConnectionStatusAtom,
@@ -93,22 +93,31 @@ export const SipProvider = ({ children }: PropsWithChildren) => {
     // Layer 2: Fire sendBeacon to auto-dispose if user confirms leave
     // These two layers protect against the "agent refreshes mid-call → stuck in ACW" bug.
     // Layer 3 (server-side ACW timeout) lives in supervisor.service.ts.
+    //
+    // IMPORTANT: beforeunload reads callState via a ref (not the dep array)
+    // because adding callState to deps causes the cleanup to fire on every
+    // state transition → disconnectSip() → kills the call mid-flight.
+    const callStateRef = useRef(callState);
+    callStateRef.current = callState;
+
     useEffect(() => {
         const handleBeforeUnload = (e: BeforeUnloadEvent) => {
             const ucid = localStorage.getItem('helix_active_ucid');
+            const state = callStateRef.current;
 
             // Layer 1: Show browser "Leave page?" dialog during active calls
-            if (callState === 'active' || callState === 'ringing-in' || callState === 'ringing-out') {
+            if (state === 'active' || state === 'ringing-in' || state === 'ringing-out') {
                 e.preventDefault();
                 e.returnValue = '';
             }
 
             // Layer 2: Fire disposition beacon if there's an active UCID
-            // sendBeacon is guaranteed to fire even during page unload
             if (ucid) {
+                const agentCfg = JSON.parse(localStorage.getItem('helix_agent_config') ?? '{}');
                 const payload = JSON.stringify({
                     ucid,
                     disposition: 'CALLBACK_REQUESTED',
+                    agentId: agentCfg.ozonetelAgentId,
                     autoDisposed: true,
                 });
                 navigator.sendBeacon('/api/ozonetel/dispose', new Blob([payload], { type: 'application/json' }));
@@ -125,7 +134,7 @@ export const SipProvider = ({ children }: PropsWithChildren) => {
             window.removeEventListener('unload', handleUnload);
             disconnectSip();
         };
-    }, [callState]);
+    }, []); // empty deps — runs once on mount, cleanup only on unmount
 
     return <>{children}</>;
 };