debug(voice): add temporary console logs around accept-call path

Trace every checkpoint between the green Accept button click and the
backend POST so we can see exactly where the silent failure happens
(0 /accept requests landing on backend, no console errors, no network
requests reported by the user). Logs prefixed [CW Voice] for grep.
Will revert once the root cause is identified.

app/javascript/dashboard/components/widgets/FloatingCallWidget.vue

@@ -74,7 +74,22 @@ const handleEndCall = async () => {
 };
 
 const handleJoinCall = async call => {
-  if (!call || isJoining.value) return;
+  // eslint-disable-next-line no-console
+  console.log('[CW Voice] handleJoinCall', {
+    call,
+    isJoining: isJoining.value,
+    hasActiveCall: hasActiveCall.value,
+  });
+  if (!call) {
+    // eslint-disable-next-line no-console
+    console.warn('[CW Voice] handleJoinCall: no call object');
+    return;
+  }
+  if (isJoining.value) {
+    // eslint-disable-next-line no-console
+    console.warn('[CW Voice] handleJoinCall: already joining (stuck flag?)');
+    return;
+  }
   const { conversation } = getCallInfo(call);
 
   // End current active call before joining new one

app/javascript/dashboard/composables/useCallSession.js

@@ -122,22 +122,45 @@ export function useCallSession() {
   };
 
   const joinCall = async ({ conversationId, inboxId, callSid }) => {
-    if (isJoining.value) return null;
+    // eslint-disable-next-line no-console
+    console.log('[CW Voice] joinCall', { conversationId, inboxId, callSid });
+    if (isJoining.value) {
+      // eslint-disable-next-line no-console
+      console.warn('[CW Voice] joinCall: isJoining flag stuck');
+      return null;
+    }
 
     isJoining.value = true;
     try {
       const call = findCall(callSid);
+      // eslint-disable-next-line no-console
+      console.log('[CW Voice] joinCall: found call?', call);
       if (isWhatsappCall(call)) {
+        // eslint-disable-next-line no-console
+        console.log('[CW Voice] joinCall: WhatsApp branch', {
+          callId: call.callId,
+          hasSdpOffer: Boolean(call.sdpOffer),
+          hasIceServers: Boolean(call.iceServers),
+        });
         await whatsappSession.acceptIncomingCall({
           callId: call.callId,
           sdpOffer: call.sdpOffer,
           iceServers: call.iceServers,
         });
+        // eslint-disable-next-line no-console
+        console.log('[CW Voice] joinCall: WhatsApp accept POST returned OK');
         callsStore.setCallActive(callSid);
         durationTimer.start();
         return { callId: call.callId };
       }
 
+      // eslint-disable-next-line no-console
+      console.log(
+        '[CW Voice] joinCall: Twilio branch (provider not whatsapp)',
+        {
+          provider: call?.provider,
+        }
+      );
       const device = await TwilioVoiceClient.initializeDevice(inboxId);
       if (!device) return null;