로그인 화면 플랫 UI 수정

userfront/test/theme_controller_test.dart

@@ -8,25 +8,25 @@ void main() {
 
   setUp(() async {
     SharedPreferences.setMockInitialValues({});
-    await ThemeController.instance.setThemeMode(ThemeMode.light);
+    await ThemeController.app.setThemeMode(ThemeMode.light);
   });
 
   test('저장된 dark 값을 복원한다', () async {
     SharedPreferences.setMockInitialValues({
-      ThemeController.storageKey: 'dark',
+      ThemeController.appStorageKey: 'dark',
     });
 
-    await ThemeController.instance.restore();
+    await ThemeController.app.restore();
 
-    expect(ThemeController.instance.value, ThemeMode.dark);
+    expect(ThemeController.app.value, ThemeMode.dark);
   });
 
   test('toggle 결과를 저장한다', () async {
-    await ThemeController.instance.restore();
-    await ThemeController.instance.toggle();
+    await ThemeController.app.restore();
+    await ThemeController.app.toggle();
 
     final prefs = await SharedPreferences.getInstance();
-    expect(ThemeController.instance.value, ThemeMode.dark);
-    expect(prefs.getString(ThemeController.storageKey), 'dark');
+    expect(ThemeController.app.value, ThemeMode.dark);
+    expect(prefs.getString(ThemeController.appStorageKey), 'dark');
   });
 }