admin page for category mappings. fixed some bugs and other tweaks

app/gunbuilder/[categoryId]/page.tsx

@@ -30,6 +30,9 @@ const CATEGORY_TO_PART_ROLES: Record<CategoryId, string[]> = {
   buffer: ["buffer-kit"],
   lowerParts: ["lower-parts-kit"],
   sights: ["sight"],
+  lower: ["lower-receiver"],
+  optic: ["optic"],
+  stock: ["stock"],
 };
 
 // sort options
@@ -239,7 +242,7 @@ export default function CategoryPage() {
             href="/gunbuilder"
             className="text-xs text-zinc-400 hover:text-zinc-300 mb-4 inline-block"
           >
-            ← Back to Gunbuilder
+            ← Back to The Armory
           </Link>
           <div className="flex items-start justify-between gap-4">
             <div>