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apps/app_sudoku/lib/main.dart

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+// apps/app_sudoku/lib/main.dart
+import 'package:flutter/material.dart';
+import 'package:google_mobile_ads/google_mobile_ads.dart';
+import 'package:provider/provider.dart';
+
+// [C] 공통 서비스
+import 'package:service_api/service_api.dart';
+// [A] 공통 UI 셸 (인트로 화면)
+import 'package:feature_common/feature_common.dart'; 
+// [B] 스도쿠 게임 (로비 화면)
+import 'package:feature_game_sudoku/feature_game_sudoku.dart'; 
+
+void main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+  await MobileAds.instance.initialize();
+
+  runApp(
+    // 🔽 [수정] ChangeNotifierProvider -> MultiProvider
+    MultiProvider(
+      providers: [
+        // 1. 기존 ThemeNotifier
+        ChangeNotifierProvider(
+          // 🔽 [수정] .loadTheme() 호출 (앱 시작 시 테마 로드)
+          create: (_) => ThemeNotifier(),
+        ),
+        
+        // 🔽 [신규] SessionNotifier 추가
+        ChangeNotifierProvider(
+          create: (_) => SessionNotifier(),
+        ),
+      ],
+      child: const MyApp(),
+    ),
+  );
+}
+
+class MyApp extends StatelessWidget {
+  const MyApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    // 🔽 [수정] context.watch 대신 context.select를 사용하여
+    // 테마 변경 시에만 MaterialApp이 재빌드되도록 최적화
+    final themeData = context.select((ThemeNotifier n) => n.currentTheme);
+    final darkThemeData = context.select((ThemeNotifier n) => n.currentDarkTheme);
+    final themeMode = context.select((ThemeNotifier n) => n.currentThemeMode);
+
+    return MaterialApp(
+      title: '스도쿠 게임',
+      theme: themeData,
+      darkTheme: darkThemeData,
+      themeMode: themeMode,
+      debugShowCheckedModeBanner: false,
+
+      home: IntroScreen(
+        nextScreenBuilder: (context) => const SudokuLobbyScreen(),
+      ),
+    );
+  }
+}