riverpod_app_theme: switching theme with provider

app.dart

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return Consumer(
      builder: (_, ref, __) => MaterialApp(
        debugShowCheckedModeBanner: false,
        
        // Define a light and dark color theme. Then, read the user's
        // preferred ThemeMode (light, dark, or system default) from the
        // ThemingController to display the correct theme.
        theme: ThemeData(useMaterial3: true),
        darkTheme: ThemeData.dark(useMaterial3: true),
        themeMode: ref.watch(themingControllerProvider),
        home: const ThemingView(),
      ),
    );
  }
}