feat(library): add vocation filter, normalize categories, improve grid layout

Added vocation state and included it in query string builder, updated onFilter to accept a vocation parameter, improved grid layout with grid flow classes, normalized category names for consistent item icons, and refined stats mapping to handle type safety.

app/api/items/route.ts

@@ -19,18 +19,21 @@ export async function GET(req: NextRequest) {
     const rarities = parseArray(searchParams.get("rarity"));
     const sortParam = (searchParams.get("sort") || "name") as
       | "name"
-      | "price-asc"
-      | "price-desc"
-      | "rarity"
-      | "recent";
+      | "level-asc"
+      | "level-desc"
+      | "weight-asc"
+      | "weight-desc"
+      | "category";
     const page = Number(searchParams.get("page") || "1");
     const pageSize = Number(searchParams.get("pageSize") || "24");
+    const voc = searchParams.get("voc") || undefined;
 
     const { items, total } = searchItems({
       q,
       categories,
       rarities,
       sort: sortParam,
+      vocation: voc,
       page,
       pageSize,
     });