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lib/utils/constants.dart

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+/// Shared string keys, timings, and layout breakpoints used across the app.
+library;
+
+/// Human-readable name shown in the splash screen, app bars, and About tile.
+const String kAppName = 'MyApp';
+
+/// Package / Android application id.
+const String kPackageName = 'com.example.myapp';
+
+/// How long the splash screen stays visible before navigating to the shell.
+const Duration kSplashDuration = Duration(seconds: 2);
+
+/// SharedPreferences keys.
+abstract final class StorageKeys {
+  static const themeMode = 'theme_mode';
+  static const useRemoteData = 'use_remote_data';
+}
+
+/// Named routes registered on [MaterialApp].
+abstract final class AppRoutes {
+  static const splash = '/';
+  static const shell = '/shell';
+  static const itemDetail = '/item';
+  static const addItem = '/add-item';
+}
+
+/// Width thresholds used to adapt padding and card density.
+abstract final class Breakpoints {
+  static const compact = 600.0;
+  static const medium = 840.0;
+}
+
+/// Maximum content width on tablets / large phones so lists stay readable.
+const double kMaxContentWidth = 720.0;