Scaffold Block Seasons Flutter app

flutter create (com.airkjw.blockseasons, iOS+Android), Riverpod,
shared_preferences, audioplayers, gen-l10n EN/KO wiring, app shell
with Home -> Game placeholder.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

test/widget_test.dart

@@ -0,0 +1,13 @@
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:block_seasons/app.dart';
+
+void main() {
+  testWidgets('home screen shows title and play button', (tester) async {
+    await tester.pumpWidget(const BlockSeasonsApp());
+    await tester.pumpAndSettle();
+
+    expect(find.text('Block Seasons'), findsOneWidget);
+    expect(find.text('Play'), findsOneWidget);
+  });
+}