feat: smart badge counting, persisted unreads, flutter_app_badger, race condition fixes

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	ios/Runner/AppDelegate.swift	diff | view | blame | history
	lib/screens/chat_screen.dart	diff | view | blame | history
	lib/services/push_service.dart	diff | view | blame | history
	macos/Flutter/GeneratedPluginRegistrant.swift	diff | view | blame | history
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