feat(frontend): implement unified design system with 17 reusable template components, skeleton loading states, and golden-ratio-based layouts

frontend/src/pages/AusruestungsanfrageArtikelDetail.tsx

@@ -335,7 +335,7 @@ export default function AusruestungsanfrageArtikelDetail() {
                 const val = e.target.value ? Number(e.target.value) : '';
                 setMainKat(val);
                 if (val) {
-                  const subs = subKategorienOf(val as number);
+                  subKategorienOf(val as number);
                   setForm(f => ({ ...f, kategorie_id: val as number }));
                 } else {
                   setForm(f => ({ ...f, kategorie_id: null }));