Код-ревью: экран каталога

class _CatalogState extends State<Catalog> {
  String query = '';

  @override
  Widget build(BuildContext context) {
    final filtered = widget.products
        .where((p) => p.title.toLowerCase().contains(query.toLowerCase()))
        .toList()
      ..sort((a, b) => a.title.compareTo(b.title));
    return Column(children: [
      TextField(onChanged: (v) => setState(() => query = v)),
      Expanded(
        child: ListView(
          children: [for (final p in filtered) ProductTile(p)],
        ),
      ),
      Opacity(opacity: 0.9, child: Footer(stats: computeStats(widget.products))),
    ]);
  }
}