ui.dart

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Connectivity Checker'),
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: () => Navigator.push(
            context,
            MaterialPageRoute(builder: (context) => const SecondPage()),
          ),
          child: const Text('Next Page'),
        ),
      ),
    );
  }