在 SwiftUI 中，导航和数据流如何借助 NavigationStack 工作？

struct AppView: View {
    @State private var path: [Route] = []      // the navigation stack, as data

    var body: some View {
        NavigationStack(path: $path) {
            List(products) { p in
                NavigationLink("Open", value: Route.detail(p.id))  // append value
            }
            .navigationDestination(for: Route.self) { route in
                switch route {
                case .detail(let id): DetailView(id: id)
                }
            }
        }
    }
}
enum Route: Hashable { case detail(Int) }