Fix TypeScript build errors

- GuestReviewPage: fix hotel config lookup type (slug && obj returns '' | obj)
- PosPage, ReviewsPage: change ComponentType<{size?:number}> to ElementType for Lucide icon compatibility

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

src/pages/GuestReviewPage.tsx

@@ -48,7 +48,7 @@ const DEFAULT_CONFIG: HotelConfig = {
 
 export function GuestReviewPage() {
   const { slug } = useParams<{ slug: string }>()
-  const hotel = (slug && MOCK_HOTELS[slug]) ?? DEFAULT_CONFIG
+  const hotel: HotelConfig = (slug ? MOCK_HOTELS[slug] : null) ?? DEFAULT_CONFIG
 
   const [rating,    setRating]    = useState(0)
   const [hover,     setHover]     = useState(0)