다크 모드 전역 상태와 테마 기반 추가

userfront/lib/core/theme/app_theme.dart

@@ -0,0 +1,148 @@
+import 'package:flutter/material.dart';
+
+ThemeData buildLightTheme() {
+  final scheme =
+      ColorScheme.fromSeed(
+        seedColor: const Color(0xFF1A1F2C),
+        brightness: Brightness.light,
+      ).copyWith(
+        surface: Colors.white,
+        surfaceContainerLowest: const Color(0xFFF7F8FA),
+        surfaceContainerLow: const Color(0xFFF3F4F6),
+        surfaceContainerHighest: const Color(0xFFE5E7EB),
+        outline: const Color(0xFFD1D5DB),
+        outlineVariant: const Color(0xFFE5E7EB),
+        primary: const Color(0xFF1A1F2C),
+        onPrimary: Colors.white,
+        onSurface: const Color(0xFF111827),
+        onSurfaceVariant: const Color(0xFF6B7280),
+      );
+  return _buildTheme(scheme);
+}
+
+ThemeData buildDarkTheme() {
+  final scheme =
+      ColorScheme.fromSeed(
+        seedColor: const Color(0xFF7DD3FC),
+        brightness: Brightness.dark,
+      ).copyWith(
+        surface: const Color(0xFF0F172A),
+        surfaceContainerLowest: const Color(0xFF020617),
+        surfaceContainerLow: const Color(0xFF111827),
+        surfaceContainerHighest: const Color(0xFF1F2937),
+        outline: const Color(0xFF334155),
+        outlineVariant: const Color(0xFF1E293B),
+        primary: const Color(0xFFBAE6FD),
+        onPrimary: const Color(0xFF082F49),
+        onSurface: const Color(0xFFF8FAFC),
+        onSurfaceVariant: const Color(0xFF94A3B8),
+      );
+  return _buildTheme(scheme);
+}
+
+ThemeData _buildTheme(ColorScheme colorScheme) {
+  final isDark = colorScheme.brightness == Brightness.dark;
+  final base = ThemeData(
+    useMaterial3: true,
+    colorScheme: colorScheme,
+    fontFamily: 'NotoSansKR',
+  );
+
+  return base.copyWith(
+    scaffoldBackgroundColor: colorScheme.surfaceContainerLowest,
+    pageTransitionsTheme: const PageTransitionsTheme(
+      builders: {
+        TargetPlatform.android: NoTransitionsBuilder(),
+        TargetPlatform.iOS: NoTransitionsBuilder(),
+        TargetPlatform.linux: NoTransitionsBuilder(),
+        TargetPlatform.macOS: NoTransitionsBuilder(),
+        TargetPlatform.windows: NoTransitionsBuilder(),
+        TargetPlatform.fuchsia: NoTransitionsBuilder(),
+      },
+    ),
+    appBarTheme: AppBarTheme(
+      elevation: 0,
+      centerTitle: false,
+      backgroundColor: colorScheme.surface,
+      foregroundColor: colorScheme.onSurface,
+      surfaceTintColor: Colors.transparent,
+    ),
+    cardTheme: CardThemeData(
+      color: colorScheme.surface,
+      elevation: 0,
+      surfaceTintColor: Colors.transparent,
+      shape: RoundedRectangleBorder(
+        borderRadius: BorderRadius.circular(16),
+        side: BorderSide(color: colorScheme.outlineVariant),
+      ),
+    ),
+    dividerTheme: DividerThemeData(
+      color: colorScheme.outlineVariant,
+      thickness: 1,
+    ),
+    drawerTheme: DrawerThemeData(
+      backgroundColor: colorScheme.surface,
+      surfaceTintColor: Colors.transparent,
+    ),
+    dialogTheme: DialogThemeData(
+      backgroundColor: colorScheme.surface,
+      surfaceTintColor: Colors.transparent,
+      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(24)),
+    ),
+    inputDecorationTheme: InputDecorationTheme(
+      filled: true,
+      fillColor: isDark ? colorScheme.surfaceContainerLow : colorScheme.surface,
+      border: OutlineInputBorder(
+        borderRadius: BorderRadius.circular(14),
+        borderSide: BorderSide(color: colorScheme.outline),
+      ),
+      enabledBorder: OutlineInputBorder(
+        borderRadius: BorderRadius.circular(14),
+        borderSide: BorderSide(color: colorScheme.outline),
+      ),
+      focusedBorder: OutlineInputBorder(
+        borderRadius: BorderRadius.circular(14),
+        borderSide: BorderSide(color: colorScheme.primary, width: 1.4),
+      ),
+      labelStyle: TextStyle(color: colorScheme.onSurfaceVariant),
+      hintStyle: TextStyle(color: colorScheme.onSurfaceVariant),
+      prefixIconColor: colorScheme.onSurfaceVariant,
+    ),
+    filledButtonTheme: FilledButtonThemeData(
+      style: FilledButton.styleFrom(
+        minimumSize: const Size.fromHeight(50),
+        backgroundColor: colorScheme.primary,
+        foregroundColor: colorScheme.onPrimary,
+        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)),
+      ),
+    ),
+    outlinedButtonTheme: OutlinedButtonThemeData(
+      style: OutlinedButton.styleFrom(
+        foregroundColor: colorScheme.onSurface,
+        side: BorderSide(color: colorScheme.outline),
+        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)),
+      ),
+    ),
+    tabBarTheme: TabBarThemeData(
+      dividerColor: colorScheme.outlineVariant,
+      labelColor: colorScheme.onSurface,
+      unselectedLabelColor: colorScheme.onSurfaceVariant,
+      indicatorColor: colorScheme.primary,
+    ),
+  );
+}
+
+class NoTransitionsBuilder extends PageTransitionsBuilder {
+  const NoTransitionsBuilder();
+
+  @override
+  Widget buildTransitions<T>(
+    PageRoute<T> route,
+    BuildContext context,
+    Animation<double> animation,
+    Animation<double> secondaryAnimation,
+    Widget child,
+  ) {
+    return child;
+  }
+}

userfront/lib/core/theme/theme_controller.dart

@@ -0,0 +1,32 @@
+import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class ThemeController extends ValueNotifier<ThemeMode> {
+  ThemeController._() : super(ThemeMode.light);
+
+  static const storageKey = 'userfront_theme';
+  static final ThemeController instance = ThemeController._();
+
+  bool get isDark => value == ThemeMode.dark;
+
+  Future<void> restore() async {
+    final prefs = await SharedPreferences.getInstance();
+    final stored = prefs.getString(storageKey);
+    value = stored == 'dark' ? ThemeMode.dark : ThemeMode.light;
+  }
+
+  Future<void> setThemeMode(ThemeMode mode) async {
+    if (value != mode) {
+      value = mode;
+    }
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString(
+      storageKey,
+      mode == ThemeMode.dark ? 'dark' : 'light',
+    );
+  }
+
+  Future<void> toggle() {
+    return setThemeMode(isDark ? ThemeMode.light : ThemeMode.dark);
+  }
+}

userfront/lib/core/widgets/theme_toggle_button.dart

@@ -0,0 +1,44 @@
+import 'package:easy_localization/easy_localization.dart' hide tr;
+import 'package:flutter/material.dart';
+import 'package:userfront/i18n.dart';
+
+import '../theme/theme_controller.dart';
+
+class ThemeToggleButton extends StatelessWidget {
+  const ThemeToggleButton({super.key, this.compact = false});
+
+  final bool compact;
+
+  @override
+  Widget build(BuildContext context) {
+    context.locale;
+
+    return ValueListenableBuilder<ThemeMode>(
+      valueListenable: ThemeController.instance,
+      builder: (context, mode, _) {
+        final isLight = mode == ThemeMode.light;
+        final icon = isLight
+            ? Icons.light_mode_outlined
+            : Icons.dark_mode_outlined;
+        final label = isLight
+            ? tr('ui.common.theme_light', fallback: 'Light')
+            : tr('ui.common.theme_dark', fallback: 'Dark');
+        final tooltip = tr('ui.common.theme_toggle', fallback: '테마 전환');
+
+        if (compact) {
+          return IconButton(
+            tooltip: tooltip,
+            onPressed: () => ThemeController.instance.toggle(),
+            icon: Icon(icon),
+          );
+        }
+
+        return OutlinedButton.icon(
+          onPressed: () => ThemeController.instance.toggle(),
+          icon: Icon(icon, size: 18),
+          label: Text(label),
+        );
+      },
+    );
+  }
+}

userfront/lib/main.dart

@@ -24,6 +24,8 @@ import 'core/services/logger_service.dart';
 import 'core/services/null_check_recovery.dart';
 import 'core/services/web_window.dart';
 import 'core/notifiers/auth_notifier.dart';
+import 'core/theme/app_theme.dart';
+import 'core/theme/theme_controller.dart';
 import 'core/i18n/locale_gate.dart';
 import 'core/i18n/locale_registry.dart';
 import 'core/i18n/locale_utils.dart';
@@ -106,6 +108,7 @@ void main() async {
 
   // 0. Initialize Logger
   LoggerService.init();
+  await ThemeController.instance.restore();
 
   // 폰트를 먼저 로딩해서 렌더링 깨짐(FOIT/FOUT) 최소화
   await _loadBundledFonts();
@@ -366,50 +369,25 @@ class BaronSSOApp extends StatelessWidget {
     final locale =
         localization?.currentLocale ?? Locale(resolvePreferredLocaleCode());
 
-    return MaterialApp.router(
-      title: tr('ui.userfront.app_title'),
-      localizationsDelegates: delegates,
-      supportedLocales: supportedLocales,
-      locale: locale,
-      builder: (context, child) {
-        return Stack(
-          children: [if (child != null) child, const ToastViewport()],
+    return ValueListenableBuilder<ThemeMode>(
+      valueListenable: ThemeController.instance,
+      builder: (context, themeMode, _) {
+        return MaterialApp.router(
+          title: tr('ui.userfront.app_title'),
+          localizationsDelegates: delegates,
+          supportedLocales: supportedLocales,
+          locale: locale,
+          builder: (context, child) {
+            return Stack(
+              children: [if (child != null) child, const ToastViewport()],
+            );
+          },
+          theme: buildLightTheme(),
+          darkTheme: buildDarkTheme(),
+          themeMode: themeMode,
+          routerConfig: _router,
         );
       },
-      theme: ThemeData(
-        colorScheme: ColorScheme.fromSeed(
-          seedColor: const Color(0xFF1A1F2C), // Dark Navy/Black base
-          brightness: Brightness.light,
-        ),
-        useMaterial3: true,
-        fontFamily: 'NotoSansKR',
-        pageTransitionsTheme: const PageTransitionsTheme(
-          builders: {
-            TargetPlatform.android: NoTransitionsBuilder(),
-            TargetPlatform.iOS: NoTransitionsBuilder(),
-            TargetPlatform.linux: NoTransitionsBuilder(),
-            TargetPlatform.macOS: NoTransitionsBuilder(),
-            TargetPlatform.windows: NoTransitionsBuilder(),
-            TargetPlatform.fuchsia: NoTransitionsBuilder(),
-          },
-        ),
-      ),
-      routerConfig: _router,
     );
   }
 }
-
-class NoTransitionsBuilder extends PageTransitionsBuilder {
-  const NoTransitionsBuilder();
-
-  @override
-  Widget buildTransitions<T>(
-    PageRoute<T> route,
-    BuildContext context,
-    Animation<double> animation,
-    Animation<double> secondaryAnimation,
-    Widget child,
-  ) {
-    return child;
-  }
-}

userfront/pubspec.lock

@@ -485,7 +485,7 @@ packages:
     source: hosted
     version: "3.2.0"
   shared_preferences:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: shared_preferences
       sha256: "2939ae520c9024cb197fc20dee269cd8cdbf564c8b5746374ec6cacdc5169e64"

userfront/pubspec.yaml

@@ -48,6 +48,7 @@ dependencies:
     easy_localization: ^3.0.7
     toml: ^0.15.0
     web: ^1.1.0
+    shared_preferences: ^2.5.4
 
 dev_dependencies:
     flutter_test: