feat: add loader bar to animate loading state

website/src/repl/Loader.jsx

@@ -0,0 +1,13 @@
+import { cx } from '@strudel.cycles/react';
+import React from 'react';
+
+function Loader({ active }) {
+  return (
+    <div className="overflow-hidden opacity-50 fixed top-0 left-0 w-full z-[1000]">
+      <div className={cx('h-[2px] block w-full', active ? 'bg-foreground animate-train' : 'bg-transparent')}>
+        <div />
+      </div>
+    </div>
+  );
+}
+export default Loader;