[bug]回复内容过多导致白屏无字

ai回复内容过程里，如果内容过多就会在回复了一半左右的时候，ui界面部分文字消失

<img width="1080" height="2460" alt="Image" src="https://github.com/user-attachments/assets/2ba6b1dd-bb8f-4b63-a5a2-914a69421417" />
<img width="1080" height="2460" alt="Image" src="https://github.com/user-attachments/assets/b886d430-e826-4609-9328-613a8b7c6ca9" />