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/helper/voice.js

@@ -23,11 +23,11 @@ const shouldSkipCall = (callDirection, senderId, currentUserId) => {
 };
 
 function extractCallData(message) {
-  const contentData = message?.content_attributes?.data || {};
+  const call = message?.call || {};
   return {
-    callSid: contentData.call_sid,
-    status: contentData.status,
-    callDirection: contentData.call_direction,
+    callSid: call.provider_call_id,
+    status: call.status,
+    callDirection: call.direction === 'outgoing' ? 'outbound' : 'inbound',
     conversationId: message?.conversation_id,
     senderId: message?.sender?.id,
   };
@@ -60,9 +60,11 @@ export function handleVoiceCallUpdated(commit, message, currentUserId) {
 
   callsStore.handleCallStatusChanged({ callSid, status, conversationId });
 
-  const callInfo = { conversationId, callStatus: status };
-  commit(types.UPDATE_CONVERSATION_CALL_STATUS, callInfo);
-  commit(types.UPDATE_MESSAGE_CALL_STATUS, callInfo);
+  commit(types.UPDATE_MESSAGE_CALL_STATUS, {
+    conversationId,
+    callStatus: status,
+    callSid,
+  });
 
   const isNewCall =
     status === 'ringing' &&