Add base skeleton

moneymgr_mobile/lib/utils/extensions.dart

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+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',
+  };
+}

moneymgr_mobile/lib/utils/hooks.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_hooks/flutter_hooks.dart';
+
+typedef AsyncTask = ({
+ValueNotifier<Future<void>?> pending,
+AsyncSnapshot<void> snapshot,
+bool hasError,
+});
+
+/// Creates a hook that provides a [snapshot] of the current asynchronous task passed
+/// to [pending] and a [hasError] value.
+AsyncTask useAsyncTask() {
+  final pending = useState<Future<void>?>(null);
+  final snapshot = useFuture(pending.value);
+  final hasError =
+      snapshot.hasError && snapshot.connectionState != ConnectionState.waiting;
+
+  return (pending: pending, snapshot: snapshot, hasError: hasError);
+}