fix: correct RSC error patterns and extract skills grouping to utility

src/widgets/BioSection/ui/BioSection/BioSection.tsx

@@ -1,3 +1,4 @@
+import { notFound } from 'next/navigation';
 import type { PageContentRecord } from '$shared/api';
 import { getFirstRecord } from '$shared/api';
 
@@ -11,7 +12,7 @@ export default async function BioSection() {
   });
 
   if (!data) {
-    return <p>Loading bio content...</p>;
+    notFound();
   }
 
   return (