feat: voice-call UX fixes (#14579)

## Linear ticket
https://linear.app/chatwoot/issue/CW-7187/voice-calls-followup-tasks

## Description

Improvements to the WhatsApp voice-calling experience plus a cheaper,
more accurate audio-transcription model.
- First-time callers now get a real name. An inbound WhatsApp call
creates the contact from the caller's WhatsApp profile name instead of
the bare phone number.
- Clear, consistent call attribution. Call bubbles show a unified
"Handled by {agent}"
- Cleaner call widget. The dismiss (✕) button is shown only for incoming
calls
- WhatsApp calling for manual inboxes. voice_calling_supported? now
covers any whatsapp_cloud inbox
- Transcription: whisper-1 → gpt-4o-mini-transcribe.

## Type of change

- [ ] New feature (non-breaking change which adds functionality)


## Checklist:

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

app/javascript/dashboard/stores/calls.js

@@ -54,7 +54,9 @@ export const useCallsStore = defineStore('calls', {
         return;
       }
 
-      this.calls.push({
+      // Prepend so the newest call surfaces as the primary card (incomingCalls[0])
+      // and older calls drop into the stack below it.
+      this.calls.unshift({
         ...callData,
         isActive: false,
       });