Theme configuration

lib/providers/shared_preferences_provider.dart

@@ -1,6 +1,9 @@
 import 'package:riverpod_annotation/riverpod_annotation.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
-final sharedPreferencesProvider = Provider<SharedPreferences>((ref) {
+part 'shared_preferences_provider.g.dart';
+
+@Riverpod(keepAlive: true)
+SharedPreferences sharedPreferences(SharedPreferencesRef ref) {
   throw UnimplementedError();
-});
+}