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// Feature module exposes a small public API
public struct CheckoutFeature {
    let cart: CartRepository
    let payments: PaymentGateway

    @MainActor
    public func makeView() -> some View {
        CheckoutView(model: .init(cart: cart, payments: payments))
    }
}

actor CartStore: CartRepository {
    private var items: [CartItem] = []
    func add(_ item: CartItem) async { items.append(item) }
}