如何将堆栈作为CustomScrollView的子级

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('CustomScrollView with Stack'),
        ),
        body: CustomScrollView(
          slivers: [
            SliverAppBar(
              title: Text('Scrollable Content'),
              expandedHeight: 200,
              flexibleSpace: FlexibleSpaceBar(
                background: Image.asset('assets/image.jpg', fit: BoxFit.cover),
              ),
            ),
            SliverList(
              delegate: SliverChildBuilderDelegate(
                (context, index) {
                  return Container(
                    padding: EdgeInsets.all(16),
                    child: Stack(
                      children: [
                        Container(
                          color: Colors.grey[200],
                          padding: EdgeInsets.all(16),
                          child: Text('Item $index'),
                        ),
                        Positioned(
                          right: 0,
                          top: 0,
                          child: Icon(Icons.star, color: Colors.yellow),
                        ),
                      ],
                    ),
                  );
                },
                childCount: 50,
              ),
            ),
          ],
        ),
      ),
    );
  }
}