✨ New Features | 新增
- 线面积分 Unicode 符号：新增 6 个线面积分相关 Unicode 符号（∮ ∯ ∰ ∱ ∲ ∳），替代 Obsidian/MathJax 不支持的
\oiint、\oiiint 等 LaTeX 命令，在 variable_sized_symbols 分类中可直接点击插入。
Line & surface integral Unicode symbols: Added 6 Unicode integral symbols (∮ ∯ ∰ ∱ ∲ ∳) as replacements for \oiint,
\oiiint, etc. that MathJax does not support — insertable directly from the "Variable-sized symbols" category.