ListView.builder(
// 역순 배치
reverse: true,
final List<ChatMessage> _chatLog = [];
void update() => setState(() {});
void sendMessage(String prompt) async {
gptController.textEditingController.clear();
update();
_chatLog.insert(0, ChatMessage(role: 'User', content: prompt));
final response = await gptService.fetchChatGPTResponse(prompt);
update();
_chatLog.insert(0, ChatMessage(role: 'ChatGPT', content: response));
}