feat: Initialize Flutter app with authentication and scheduling features

- Removed TypeScript configuration file (tsconfig.json).
- Added Flutter plugin dependencies for secure storage.
- Implemented main application structure with routing for login, profile, and schedule screens.
- Developed LoginScreen with authentication logic and user feedback.
- Created ProfileScreen to display user profile information and logout functionality.
- Built ScheduleScreen to show weekly work schedule with navigation controls.
- Integrated AuthService for handling authentication, token storage, and API interactions.
- Updated pubspec.yaml with necessary dependencies for the Flutter project.

lib/screens/login_screen.dart

@@ -0,0 +1,58 @@
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+import '../services/auth_service.dart';
+
+class LoginScreen extends StatefulWidget {
+  @override
+  _LoginScreenState createState() => _LoginScreenState();
+}
+
+class _LoginScreenState extends State<LoginScreen> {
+  final _userCtrl = TextEditingController();
+  final _pwCtrl = TextEditingController();
+  bool _loading = false;
+
+  @override
+  Widget build(BuildContext context) {
+    final auth = Provider.of<AuthService>(context);
+    // Auto-redirect if already logged in
+    if (auth.token != null) {
+      Future.microtask(() => Navigator.pushReplacementNamed(context, '/profile'));
+    }
+    return Scaffold(
+      body: Center(
+        child: Padding(
+          padding: const EdgeInsets.all(24.0),
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              Text('Bejelentkezés', style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold)),
+              SizedBox(height: 16),
+              TextField(controller: _userCtrl, decoration: InputDecoration(labelText: 'Felhasználó')),
+              SizedBox(height: 8),
+              TextField(controller: _pwCtrl, decoration: InputDecoration(labelText: 'Jelszó'), obscureText: true),
+              SizedBox(height: 16),
+              ElevatedButton(
+                onPressed: _loading ? null : () async {
+                  final username = _userCtrl.text.trim();
+                  final password = _pwCtrl.text.trim();
+                  if (username.isEmpty || password.isEmpty) {
+                    ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Kérlek add meg a felhasználónevet és jelszót')));
+                    return;
+                  }
+                  setState(() { _loading = true; });
+                  final ok = await auth.login(username, password);
+                  setState(() { _loading = false; });
+                  if (ok) Navigator.pushReplacementNamed(context, '/profile');
+                  else ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Bejelentkezés sikertelen')));
+                },
+                child: _loading ? SizedBox(height: 16, width: 16, child: CircularProgressIndicator(strokeWidth: 2)) : Text('Bejelentkezés'),
+              )
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}