fix(neon,app): Correctly mock shared preferences in screenshot tests

Signed-off-by: jld3103 <jld3103yt@gmail.com>

packages/app/integration_test/screenshot_test.dart

@@ -77,8 +77,9 @@ Future main() async {
     await SystemChrome.setEnabledSystemUIMode(SystemUiMode.manual, overlays: []);
   });
 
-  setUp(() {
+  setUp(() async {
     SharedPreferences.setMockInitialValues({});
+    NeonStorage.mock(await SharedPreferences.getInstance());
   });
 
   testWidgets('login', (final tester) async {

packages/neon/neon/lib/settings.dart

@@ -2,6 +2,6 @@ export 'package:neon/src/models/label_builder.dart';
 export 'package:neon/src/settings/models/options_category.dart';
 export 'package:neon/src/settings/models/options_collection.dart';
 export 'package:neon/src/settings/models/select_option.dart';
-export 'package:neon/src/settings/models/storage.dart' show Storable;
+export 'package:neon/src/settings/models/storage.dart' show NeonStorage, Storable;
 export 'package:neon/src/settings/models/toggle_option.dart';
 export 'package:neon/src/settings/widgets/settings_list.dart';

packages/neon/neon/lib/src/settings/models/storage.dart

@@ -36,7 +36,6 @@ enum StorageKeys implements Storable {
   final String value;
 }
 
-@internal
 final class NeonStorage {
   /// Shared preferences instance.
   ///