Fix Capacitor React/Vite + Supabase app + Android signed APK + iOS build (no Apple Dev)

I have a small React + Vite app using Capacitor and Supabase. The UI is finished and must NOT be changed. I need help with a few focused technical fixes before release: - Android push notifications (FCM) are not working at all (iOS is OK)... (Budget: €30 - €250 EUR, Jobs: Agile Development, Android, App Development, Database Management, iOS Development, Mobile App Development, Mobile App Testing, Software Development, Software Testing, Version Control Git)