feat(image): 메인 라이브 탭에 DownsampledKFImage 적용

- 수평 리스트 HStack → LazyHStack으로 교체해 프리로딩/메모리 개선

SodaLive/Sources/Live/Now/LiveNowItemView.swift

@@ -27,11 +27,11 @@ struct LiveNowItemView: View {
             VStack(spacing: 0) {
                 ZStack(alignment: .bottom) {
                     ZStack {
-                        KFImage(URL(string: item.creatorProfileImage))
-                            .cancelOnDisappear(true)
-                            .resizable()
-                            .frame(width: 72, height: 72)
-                            .clipShape(Circle())
+                        DownsampledKFImage(
+                            url: URL(string: item.creatorProfileImage),
+                            size: CGSize(width: 72, height: 72)
+                        )
+                        .clipShape(Circle())
                     }
                     .frame(width: 84, height: 84)
                     .overlay {

SodaLive/Sources/Live/Now/SectionLiveNowView.swift

@@ -42,7 +42,7 @@ struct SectionLiveNowView: View {
             
             if items.count > 0 {
                 ScrollView(.horizontal, showsIndicators: false) {
-                    HStack(alignment: .top, spacing: 16) {
+                    LazyHStack(alignment: .top, spacing: 16) {
                         ForEach(items, id: \.self) { item in
                             LiveNowItemView(item: item)
                                 .contentShape(Rectangle())