fixed layouts, routing and the platform switcher.

app/(app)/(builder)/parts/[partRole]/page.tsx

@@ -0,0 +1,16 @@
+import PartsBrowseClient from "@/components/parts/PartsBrowseClient";
+
+export default async function PartsBrowsePage({
+  params,
+}: {
+  params: Promise<{ partRole: string }>;
+}) {
+  const { partRole } = await params;
+
+  return (
+    <PartsBrowseClient
+      partRole={decodeURIComponent(partRole)}
+      platform={null} // let client read ?platform=... or default
+    />
+  );
+}