fix(knowledge): improve upload workflow and seed manufacturers

frontend/athena/components/common/EmptyState.tsx

@@ -0,0 +1,19 @@
+"use client";
+
+import type { ReactNode } from "react";
+
+type Props = {
+  title: string;
+  description: string;
+  action?: ReactNode;
+};
+
+export default function EmptyState({ title, description, action }: Props) {
+  return (
+    <div className="rounded-lg border bg-white p-8 text-center">
+      <h2 className="text-lg font-semibold text-slate-950">{title}</h2>
+      <p className="mx-auto mt-2 max-w-xl text-sm text-slate-500">{description}</p>
+      {action && <div className="mt-5 flex justify-center">{action}</div>}
+    </div>
+  );
+}