Use new UI (#8983)

* fixup build

* swap frontends

web/src/components/ui/activity-indicator.tsx

@@ -0,0 +1,12 @@
+import { LuLoader2 } from "react-icons/lu";
+
+export default function ActivityIndicator({ size = 30 }) {
+  return (
+    <div
+      className="w-full flex items-center justify-center"
+      aria-label="Loading…"
+    >
+      <LuLoader2 className="animate-spin" size={size} />
+    </div>
+  );
+}