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

- 수평 리스트 HStack → LazyHStack으로 교체해 프리로딩/메모리 개선

SodaLive/Sources/Chat/Talk/TalkItemView.swift

@@ -16,14 +16,10 @@ struct TalkItemView: View {
     
     var body: some View {
         HStack(spacing: 13) {
-            KFImage(URL(string: item.imageUrl))
-                .placeholder { Circle().fill(Color.gray.opacity(0.2)) }
-                .retry(maxCount: 2, interval: .seconds(1))
-                .cancelOnDisappear(true)
-                .resizable()
-                .scaledToFill()
-                .frame(width: 76, height: 76)
-                .clipShape(Circle())
+            DownsampledKFImage(
+                url: URL(string: item.imageUrl),
+                size: CGSize(width: 76, height: 76)
+            ).clipShape(Circle())
             
             VStack(alignment: .leading, spacing: 6) {
                 HStack(spacing: 4) {