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lib/core/constants/app_constants.dart

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+abstract final class AppConstants {
+  static const String appName = 'Flutter Frame';
+  static const String appVersion = '1.0.0';
+
+  // Storage Keys
+  static const String accessTokenKey = 'access_token';
+  static const String refreshTokenKey = 'refresh_token';
+  static const String userKey = 'user_data';
+  static const String themeKey = 'theme_mode';
+  static const String localeKey = 'locale';
+
+  // Pagination
+  static const int defaultPageSize = 20;
+  static const int maxPageSize = 100;
+
+  // Debounce
+  static const Duration searchDebounce = Duration(milliseconds: 500);
+
+  // Animation
+  static const Duration animationDuration = Duration(milliseconds: 300);
+  static const Duration shortAnimationDuration = Duration(milliseconds: 150);
+}