Spare cards is always last

Also add warning if no cards were added

static/js/shop.jsx

@@ -4,6 +4,5 @@ import React from "react";
 import { createRoot } from "react-dom/client";
 
 import { Shop } from "./shop/Shop.jsx"
-import { data } from "./shop/utils"
 
-createRoot(document.querySelector('#root-shop')).render(<Shop data={data} />);
+createRoot(document.querySelector('#root-shop')).render(<Shop />);