Added: user settings screen, Several changes in main.lib

lib/screens/add_screen.dart

@@ -23,7 +23,6 @@ class _AddScreenState extends State<AddScreen> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: Text('Add Entry')),
       body: Padding(
         padding: const EdgeInsets.all(16.0),
         child: Form(

lib/screens/history_screen.dart

@@ -3,9 +3,6 @@ import 'package:flutter/material.dart';
 class HistoryScreen extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(title: Text('History')),
-      body: Center(child: Text('History Screen Content')),
-    );
+    return Scaffold(body: Center(child: Text('History Screen Content')));
   }
 }

lib/screens/home_screen.dart

@@ -5,7 +5,6 @@ class HomeScreen extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: Text('Fuel Stats')),
       body: SingleChildScrollView(
         child: Column(
           children: [

lib/screens/user_settings.dart

@@ -0,0 +1,32 @@
+import 'package:flutter/material.dart';
+
+class UserSettingsScreen extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: Text('User settings')),
+      body: Center(
+        child: Column(
+          spacing: 20.0,
+          children: [
+            const Text(
+              "Test User",
+              style: TextStyle(fontSize: 32, fontWeight: FontWeight.bold),
+            ),
+            ElevatedButton.icon(
+              onPressed: () {
+                // TODO: Add sign-out logic here
+              },
+              icon: Icon(Icons.logout),
+              label: Text("Sign Out"),
+              style: ElevatedButton.styleFrom(
+                backgroundColor: Colors.redAccent,
+                foregroundColor: Colors.white,
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

lib/screens/vehicles_screen.dart

@@ -79,7 +79,6 @@ class _VehiclesScreenState extends State<VehiclesScreen> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: Text('Vehicles')),
       body:
           _vehicles.isEmpty
               ? Center(child: Text('No vehicles added yet.'))