当标题中有 "<" 时，TOC 无法显示

我的标题
<img width="674" alt="Image" src="https://github.com/user-attachments/assets/9812b838-0bf9-435f-b8b4-cabfa5573564" />

TOC 展示
<img width="262" alt="Image" src="https://github.com/user-attachments/assets/52010e59-21d5-4e56-bfaa-5bbece5afc56" />

应该把 html entity 转义了再放到 toc 里面