refactor(chat): align chat header and input bar with Dart source

src/app/chat/components/index.ts

@@ -5,9 +5,8 @@
 // 屏幕 + 顶层
 export { ChatScreen } from "./chat-screen";
 
-// 顶部 + 菜单
+// 顶部
 export { ChatHeader } from "./chat-header";
-export { ChatMenuBar } from "./chat-menu-bar";
 
 // 消息区
 export { ChatArea } from "./chat-area";
@@ -16,9 +15,6 @@ export { ChatArea } from "./chat-area";
 export { ChatInputBar } from "./chat-input-bar";
 export { ChatInputTextField } from "./chat-input-text-field";
 export { ChatSendButton } from "./chat-send-button";
-export { ChatMoreButton } from "./chat-more-button";
-export { ImageUploadButton } from "./image-upload-button";
-export { FunctionButtonBar } from "./function-button-bar";
 
 // 消息气泡
 export { MessageBubble } from "./message-bubble";