fix(frontend): address static demo PR review comments

frontend/src/app/workspace/chats/[thread_id]/layout.tsx

@@ -1,8 +1,12 @@
+import { isStaticWebsiteOnly } from "@/core/static-mode";
 import { DEMO_THREAD_IDS } from "@/core/threads/static-demo";
 
 import { ChatProviders } from "./providers";
 
 export function generateStaticParams() {
+  if (!isStaticWebsiteOnly()) {
+    return [];
+  }
   return DEMO_THREAD_IDS.map((thread_id) => ({ thread_id }));
 }