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/api/channel/voice/twilioVoiceClient.js

@@ -68,7 +68,7 @@ class TwilioVoiceClient extends EventTarget {
     this.inboxId = null;
   }
 
-  async joinClientCall({ to, conversationId }) {
+  async joinClientCall({ to, conversationId, callSid }) {
     if (!this.device || !this.initialized || !to) return null;
     if (this.activeConnection) return this.activeConnection;
 
@@ -76,6 +76,7 @@ class TwilioVoiceClient extends EventTarget {
       To: to,
       is_agent: 'true',
       conversation_id: conversationId,
+      call_sid: callSid,
     };
 
     const connection = await this.device.connect({ params });

app/javascript/dashboard/api/channel/voice/voiceAPIClient.js

@@ -12,10 +12,10 @@ class VoiceAPI extends ApiClient {
     return ContactsAPI.initiateCall(contactId, inboxId).then(r => r.data);
   }
 
-  leaveConference(inboxId, conversationId) {
+  leaveConference({ inboxId, conversationId, callSid }) {
     return axios
       .delete(`${this.baseUrl()}/inboxes/${inboxId}/conference`, {
-        params: { conversation_id: conversationId },
+        params: { conversation_id: conversationId, call_sid: callSid },
       })
       .then(r => r.data);
   }