fix: TS errors — EquipmentPage purpose cast, PosPage NodeJS.Timeout

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/pages/PosPage.tsx

@@ -445,7 +445,7 @@ export function PosPage() {
   const [cashDialog, setCashDialog]   = useState<'in' | 'out' | null>(null)
   const [customService, setCustomService] = useState<{ name: string; price: string } | null>(null)
 
-  const pollRef = useRef<NodeJS.Timeout | null>(null)
+  const pollRef = useRef<ReturnType<typeof setTimeout> | null>(null)
 
   // Временные гости (mock — в будущем из API)
   const [guests] = useState<GuestRow[]>([