inventory disable

client/src/components/inventory.jsx

@@ -52,14 +52,14 @@ function Inventory(args) {
     const useMtx = (item, i) => (
         <figure key={i} onClick={() => setMtxActive(item)} >
             <figcaption>{item}</figcaption>
-            <button>¤1</button>
+            <button disabled={account.balance === 0}>¤1</button>
         </figure>
     );
 
     const availableMtx = (item, i) => (
         <figure key={i} onClick={() => mtxBuy(item)} >
             <figcaption>{item.variant}</figcaption>
-            <button>¤{item.credits}</button>
+            <button disabled={account.balance < item.credits}>¤{item.credits}</button>
         </figure>
     );