Update app/editor/index.tsx

app/editor/index.tsx

@@ -59,7 +59,7 @@ export default function Editor({ defaultValue }: { defaultValue: string }) {
   return (
     <>
       <div id="editor" ref={ref} style={{ height: "50vh" }} />
-      <button onClick={handlePreview}>preview</button>
+      <button onClick={() => handlePreview()}>preview</button>
       <div id="root" />
     </>
 }