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lib/app.dart

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+import 'package:flutter/material.dart';
+import 'config/theme.dart';
+import 'screens/chat_screen.dart';
+
+class AIChatApp extends StatelessWidget {
+  const AIChatApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'AI Chat Assistant',
+      theme: AppTheme.lightTheme,
+      darkTheme: AppTheme.darkTheme,
+      themeMode: ThemeMode.system,
+      home: const ChatScreen(),
+    );
+  }
+}