Implemented settings, new scan, enhanced UI/UX

lib/widget/app_bar.dart

@@ -0,0 +1,25 @@
+import 'package:flutter/material.dart';
+import 'package:hl_lieferservice/feature/settings/presentation/settings_page.dart';
+
+class CustomAppBar extends StatelessWidget {
+  const CustomAppBar({super.key});
+
+  void _openSettings(BuildContext context) {
+    Navigator.of(
+      context,
+    ).push(MaterialPageRoute(builder: (context) => SettingsPage()));
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return AppBar(
+      title: Center(child: Text("Holzleitner Lieferservice")),
+      actions: [
+        IconButton(
+          onPressed: () => _openSettings(context),
+          icon: Icon(Icons.settings),
+        ),
+      ],
+    );
+  }
+}