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>

lib/app.dart

@@ -0,0 +1,32 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
+
+import 'l10n/gen/app_localizations.dart';
+import 'ui/screens/home_screen.dart';
+
+class BlockSeasonsApp extends StatelessWidget {
+  const BlockSeasonsApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      onGenerateTitle: (context) => AppLocalizations.of(context)!.appTitle,
+      debugShowCheckedModeBanner: false,
+      localizationsDelegates: const [
+        AppLocalizations.delegate,
+        GlobalMaterialLocalizations.delegate,
+        GlobalWidgetsLocalizations.delegate,
+        GlobalCupertinoLocalizations.delegate,
+      ],
+      supportedLocales: const [Locale('en'), Locale('ko')],
+      theme: ThemeData(
+        colorScheme: ColorScheme.fromSeed(
+          seedColor: const Color(0xFF5B7FFF),
+          brightness: Brightness.dark,
+        ),
+        useMaterial3: true,
+      ),
+      home: const HomeScreen(),
+    );
+  }
+}

lib/l10n/app_en.arb

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+{
+  "@@locale": "en",
+  "appTitle": "Block Seasons",
+  "play": "Play",
+  "settings": "Settings",
+  "comingSoon": "Coming soon"
+}

lib/l10n/app_ko.arb

@@ -0,0 +1,7 @@
+{
+  "@@locale": "ko",
+  "appTitle": "블록 시즌즈",
+  "play": "플레이",
+  "settings": "설정",
+  "comingSoon": "준비 중"
+}

lib/main.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import 'app.dart';
+
+void main() {
+  WidgetsFlutterBinding.ensureInitialized();
+  runApp(const ProviderScope(child: BlockSeasonsApp()));
+}

lib/ui/screens/game_screen.dart

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+import 'package:flutter/material.dart';
+
+import '../../l10n/gen/app_localizations.dart';
+
+/// Placeholder until the board UI lands in Phase 2.
+class GameScreen extends StatelessWidget {
+  const GameScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context)!;
+    return Scaffold(
+      appBar: AppBar(title: Text(l10n.appTitle)),
+      body: Center(child: Text(l10n.comingSoon)),
+    );
+  }
+}

lib/ui/screens/home_screen.dart

@@ -0,0 +1,48 @@
+import 'package:flutter/material.dart';
+
+import '../../l10n/gen/app_localizations.dart';
+import 'game_screen.dart';
+
+class HomeScreen extends StatelessWidget {
+  const HomeScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context)!;
+    return Scaffold(
+      body: SafeArea(
+        child: Center(
+          child: Column(
+            mainAxisAlignment: MainAxisAlignment.center,
+            children: [
+              Text(
+                l10n.appTitle,
+                style: Theme.of(context).textTheme.displaySmall?.copyWith(
+                      fontWeight: FontWeight.bold,
+                    ),
+              ),
+              const SizedBox(height: 48),
+              FilledButton(
+                style: FilledButton.styleFrom(
+                  padding: const EdgeInsets.symmetric(
+                    horizontal: 48,
+                    vertical: 16,
+                  ),
+                  textStyle: Theme.of(context).textTheme.titleLarge,
+                ),
+                onPressed: () {
+                  Navigator.of(context).push(
+                    MaterialPageRoute(
+                      builder: (_) => const GameScreen(),
+                    ),
+                  );
+                },
+                child: Text(l10n.play),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}