Fix

• Add finer-grained persist markdown state option #306
• Support configuring delay for persist markdown state
• Fix several issues with pdf navigate
• Support locating headings in pdf view

修复

• 添加更细粒度的 persist markdown state 选项 #306
• 支持设置 persist markdown state 延时
• 解决 pdf navigate 的一些问题
• 支持 locate heading in pdf view