refactor: Simplify LazyImage component by removing unnecessary state and optimizing IntersectionObserver usage; enhance test setup with improved window.location mock

src/components/ui/LazyImage.tsx

@@ -23,7 +23,6 @@ export function LazyImage({
   ...props
 }: LazyImageProps) {
   const [isLoaded, setIsLoaded] = useState(false)
-  const [isInView, setIsInView] = useState(priority)
   const [error, setError] = useState(false)
   const imgRef = useRef<HTMLImageElement>(null)
   const [imageSrc, setImageSrc] = useState(priority ? src : placeholder)
@@ -35,14 +34,12 @@ export function LazyImage({
     const observer = new IntersectionObserver(
       ([entry]) => {
         if (entry.isIntersecting) {
-          setIsInView(true)
           setImageSrc(src)
           observer.disconnect()
         }
       },
       { rootMargin: '50px' }
     )
-
     const currentImg = imgRef.current
     if (currentImg) {
       observer.observe(currentImg)