feat: Implement home screen with navigation and update login flow

lib/screens/home_screen.dart

@@ -0,0 +1,31 @@
+import 'package:flutter/material.dart';
+import 'schedule_screen.dart';
+import 'profile_screen.dart';
+
+class HomeScreen extends StatefulWidget {
+  @override
+  _HomeScreenState createState() => _HomeScreenState();
+}
+
+class _HomeScreenState extends State<HomeScreen> {
+  int _idx = 0;
+  final _pages = [ScheduleScreen(), ProfileScreen()];
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: _pages[_idx],
+      bottomNavigationBar: BottomNavigationBar(
+        currentIndex: _idx,
+        backgroundColor: Color(0xFF0c0a0a),
+        selectedItemColor: Color(0xFFA24BFA),
+        unselectedItemColor: Colors.white70,
+        items: [
+          BottomNavigationBarItem(icon: Icon(Icons.calendar_today), label: 'Beosztás'),
+          BottomNavigationBarItem(icon: Icon(Icons.person), label: 'Profil'),
+        ],
+        onTap: (i) => setState(() { _idx = i; }),
+      ),
+    );
+  }
+}

lib/screens/login_screen.dart

@@ -44,7 +44,7 @@ class _LoginScreenState extends State<LoginScreen> {
                   setState(() { _loading = true; });
                   final ok = await auth.login(username, password);
                   setState(() { _loading = false; });
-                  if (ok) Navigator.pushReplacementNamed(context, '/profile');
+                  if (ok) Navigator.pushReplacementNamed(context, '/home');
                   else ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Bejelentkezés sikertelen')));
                 },
                 child: _loading ? SizedBox(height: 16, width: 16, child: CircularProgressIndicator(strokeWidth: 2)) : Text('Bejelentkezés'),

lib/screens/splash_screen.dart

@@ -13,9 +13,9 @@ class _SplashScreenState extends State<SplashScreen> with SingleTickerProviderSt
   void initState() {
     super.initState();
     _ctrl = AnimationController(vsync: this, duration: Duration(seconds: 3))..repeat(reverse: true);
-    // simulate load then navigate
-    Timer(Duration(seconds: 2), () {
-      Navigator.pushReplacementNamed(context, '/');
+    // simulate load then navigate depending on token presence
+    Timer(Duration(seconds: 1), () {
+      Navigator.pushReplacementNamed(context, '/home');
     });
   }