riverpod_theme_app: Setting up local storage access.

main.dart

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  
  // Create the shared_preferences instance.
  final sharedPreferences = await SharedPreferences.getInstance();

  runApp(
    ProviderScope(
      // override the prefsProvider with this value.
      overrides: [
        prefsProvider.overrideWithValue(sharedPreferences),
      ],
      child: const MyApp(),
    ),
  );
}