feat(chat-room): 채팅방에서 메시지 보내기 API 연동

- 타이핑 indicator 동작하지 않던 버그 수정
- 이미지 4:5 비율로 보이도록 수정

SodaLive/Sources/Chat/Talk/Room/ChatRoomView.swift

@@ -139,6 +139,14 @@ struct ChatRoomView: View {
                                         }
                                     }
                                 }
+                                
+                                if viewModel.showSendingMessage {
+                                    TypingIndicatorItemView(
+                                        characterName: viewModel.characterName,
+                                        characterProfileUrl: viewModel.characterProfileUrl
+                                    )
+                                    .id(viewModel.messages.count)
+                                }
                             }
                             .padding(.horizontal, 24)
                             .frame(minHeight: geometry.size.height, alignment: .bottom)
@@ -146,7 +154,12 @@ struct ChatRoomView: View {
                         .onChange(of: viewModel.messages.count) { _ in
                             if !viewModel.messages.isEmpty {
                                 withAnimation(.easeOut(duration: 0.3)) {
-                                    proxy.scrollTo(viewModel.messages.count - 1, anchor: .bottom)
+                                    proxy.scrollTo(
+                                        viewModel.showSendingMessage ?
+                                        viewModel.messages.count :
+                                        viewModel.messages.count - 1,
+                                        anchor: .bottom
+                                    )
                                 }
                             }
                         }