feat(image): 메인 홈, 채팅 - 톡 페이지에 DownsampledKFImage 적용

- 수평 리스트 HStack → LazyHStack으로 교체해 프리로딩/메모리 개선

SodaLive/Sources/Content/ContentItemView.swift

@@ -17,12 +17,11 @@ struct ContentItemView: View {
     var body: some View {
         VStack(alignment: .leading, spacing: 0) {
             ZStack(alignment: .top) {
-                KFImage(URL(string: item.coverImageUrl))
-                    .cancelOnDisappear(true)
-                    .resizable()
-                    .scaledToFill()
-                    .frame(width: 160, height: 160, alignment: .top)
-                    .cornerRadius(16)
+                DownsampledKFImage(
+                    url: URL(string: item.coverImageUrl),
+                    size: CGSize(width: 160, height: 160)
+                )
+                .cornerRadius(16)
                 
                 HStack(alignment: .top, spacing: 0) {
                     Spacer()