opt.

lib/view/widget/appbar.dart

@@ -11,7 +11,7 @@ class CustomAppBar extends StatelessWidget implements PreferredSizeWidget {
     super.key,
     this.title,
     this.actions,
-    this.centerTitle,
+    this.centerTitle = true,
     this.leading,
     this.backgroundColor,
   });

lib/view/widget/value_notifier.dart

@@ -1,16 +0,0 @@
-import 'package:flutter/foundation.dart';
-import 'package:flutter/material.dart';
-
-class ValueBuilder<T> extends ValueListenableBuilder<T> {
-  final ValueListenable<T> listenable;
-  final Widget Function() build;
-
-  ValueBuilder({
-    super.key,
-    required this.listenable,
-    required this.build,
-  }) : super(
-          valueListenable: listenable,
-          builder: (_, __, ___) => build(),
-        );
-}