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lib/app/app_providers.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+part 'app_providers.g.dart';
+
+/// 테마 모드 상태 관리
+@riverpod
+class ThemeModeNotifier extends _$ThemeModeNotifier {
+  @override
+  ThemeMode build() => ThemeMode.system;
+
+  void setThemeMode(ThemeMode mode) {
+    state = mode;
+  }
+
+  void toggleTheme() {
+    state = switch (state) {
+      ThemeMode.light => ThemeMode.dark,
+      ThemeMode.dark => ThemeMode.light,
+      ThemeMode.system => ThemeMode.dark,
+    };
+  }
+}