Add base skeleton

moneymgr_mobile/lib/utils/extensions.dart

@@ -0,0 +1,38 @@
+import 'package:flutter/material.dart';
+
+extension BuildContextX on BuildContext {
+  /// A convenient way to access [ThemeData.colorScheme] of the current context.
+  ///
+  /// This also prevents confusion with a bunch of other properties of [ThemeData]
+  /// that are less commonly used.
+  ColorScheme get colorScheme => Theme.of(this).colorScheme;
+
+  /// A convenient way to access [ThemeData.textTheme] of the current context.
+  ///
+  /// This also prevents confusion with a bunch of other properties of [ThemeData]
+  /// that are less commonly used.
+  TextTheme get textTheme => Theme.of(this).textTheme;
+
+  /// Shows a floating snack bar with text as its content.
+  ScaffoldFeatureController<SnackBar, SnackBarClosedReason> showTextSnackBar(
+      String text,
+      ) =>
+      ScaffoldMessenger.of(this).showSnackBar(SnackBar(
+        behavior: SnackBarBehavior.floating,
+        content: Text(text),
+      ));
+
+  void showAppLicensePage() => showLicensePage(
+    context: this,
+    useRootNavigator: true,
+    applicationName: 'DummyMart',
+  );
+}
+
+extension ThemeModeX on ThemeMode {
+  String get label => switch (this) {
+    ThemeMode.system => 'System',
+    ThemeMode.light => 'Light',
+    ThemeMode.dark => 'Dark',
+  };
+}