Optimize partial layout and styling to achieve uniformity and
consistency.
Some buttons's structure is `<a><span><svg/></span></a>`, while others
buttons's structure is `<a><svg/></a>`. Additionally, some buttons have
icons that are **14** in size, while others have icons that are **16**.
Now, the layout has been unified to structure `<a><svg/></a>`, and the
icon size for all buttons has been standardized to the default size of
**16**.
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
9a494af125