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-next/message/Message.vue

@@ -113,6 +113,7 @@ const props = defineProps({
     validator: value => Object.values(MESSAGE_STATUS).includes(value),
   },
   attachments: { type: Array, default: () => [] },
+  call: { type: Object, default: null }, // eslint-disable-line vue/no-unused-properties
   content: { type: String, default: null },
   contentAttributes: { type: Object, default: () => ({}) },
   contentType: {