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

lib/main.dart

@@ -3,6 +3,7 @@ import 'screens/home_screen.dart';
 import 'screens/add_screen.dart';
 import 'screens/vehicles_screen.dart';
 import 'screens/history_screen.dart';
+import 'screens/user_settings.dart';
 
 void main() {
   runApp(FuelStatsApp());
@@ -12,9 +13,9 @@ class FuelStatsApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
-      title: 'Fuel Stats',
       theme: ThemeData.dark(),
       themeMode: ThemeMode.dark,
+      debugShowCheckedModeBanner: false,
       home: MainNavigation(),
     );
   }
@@ -35,20 +36,42 @@ class _MainNavigationState extends State<MainNavigation> {
     AddScreen(),
     VehiclesScreen(),
     HistoryScreen(),
+    UserSettingsScreen(),
+  ];
+
+  final List<Widget> titles = [
+    Text("Fuel Stats"),
+    Text("Add record"),
+    Text("Vehicles"),
+    Text("History"),
   ];
 
   @override
   Widget build(BuildContext context) {
     return Scaffold(
+      appBar: AppBar(
+        title: _currentIndex <= 3 ? titles[_currentIndex] : Text("Fuel Stats"),
+        actions: [
+          IconButton(
+            icon: const Icon(Icons.person),
+            tooltip: "User settings",
+            onPressed: () {
+              Navigator.push(
+                context,
+                MaterialPageRoute(builder: (context) => UserSettingsScreen()),
+              );
+            },
+          ),
+        ],
+      ),
       body: _screens[_currentIndex],
       bottomNavigationBar: BottomNavigationBar(
-        currentIndex: _currentIndex,
+        currentIndex: _currentIndex <= 3 ? _currentIndex : 0,
         onTap: (index) => setState(() => _currentIndex = index),
         backgroundColor: Colors.grey[900],
         selectedItemColor: Colors.white,
         unselectedItemColor: Colors.grey,
-
-        items: [
+        items: const [
           BottomNavigationBarItem(icon: Icon(Icons.home), label: 'Home'),
           BottomNavigationBarItem(icon: Icon(Icons.add), label: 'Add'),
           BottomNavigationBarItem(

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.'))