Apply 3 Fixes to Flutter Voice Calling App

I’m looking for a developer to help fix 3 issues in my Flutter voice calling app. The app uses Firebase (Auth, Firestore, Cloud Functions), FCM for notifications, and Agora for voice calls. These are targeted fixes — not a rebuild. 🔧 Issues to Fix 1. Cancel Notification Timing Issue (Caller → Listener) If the caller cancels after a listener is found, notifications stop correctly. If the caller cancels while still “connecting”, the listener still receives the full ringing notification Expected behavior: notification should stop immediately when caller cancels (like WhatsApp) 2. Notification Stops When Opened (Listener App) Incoming call notification stops ringing when I open the notification tray / check notifications. Expected behavior: notification should continue ringing until accepted, rejected, or cancelled 3. Speaker / Microphone Behavior (Caller App) Speaker button appears ON by default. But audio is actually routed to earpiece. To fix it manually, I have to: turn speaker OFF, then turn it ON again. Expected behavior: speaker should actually be ON when highlighted If you’ve worked with FCM call notifications or Agora before, that’s a big plus.