feat(voice): Wire Twilio voice flow through unified call model (#14091)

Twilio voice now uses first-class `Call` records as the source of truth
for call state, instead of storing it on
`conversation.additional_attributes` and `conversation.identifier`. Each
call gets its own record, its own `voice_call` bubble matched by
`call_sid`, and its own conference name keyed off `Call.id`. Multiple
calls on the same conversation (for `lock_to_single_conversation`
inboxes) now work correctly, and the conversation card stays in sync
with the real latest message.
Fixes https://linear.app/chatwoot/issue/PLA-121/lock-to-single-thread

---------

Co-authored-by: Muhsin <12408980+muhsin-k@users.noreply.github.com>

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

@@ -44,6 +44,7 @@ const handleEndCall = async () => {
   await endCallSession({
     conversationId: call.conversationId,
     inboxId,
+    callSid: call.callSid,
   });
 };
 

app/javascript/dashboard/components/widgets/conversation/ConversationCard.vue

@@ -38,10 +38,16 @@ const unreadCount = computed(() => props.chat.unread_count);
 const hasUnread = computed(() => unreadCount.value > 0);
 const lastMessageInChat = computed(() => getLastMessage(props.chat));
 
-const voiceCallData = computed(() => ({
-  status: props.chat.additional_attributes?.call_status,
-  direction: props.chat.additional_attributes?.call_direction,
-}));
+const voiceCallData = computed(() => {
+  const last = lastMessageInChat.value;
+  if (last?.content_type !== 'voice_call' || !last.call) {
+    return { status: null, direction: null };
+  }
+  return {
+    status: last.call.status,
+    direction: last.call.direction === 'outgoing' ? 'outbound' : 'inbound',
+  };
+});
 
 const showMetaSection = computed(() => {
   return (