字体大小、间距等只支持number类型，没法自定义单位

### 🐛 Question description [Please make everyone to understand it]
字体大小、间距等只支持number类型，没法自定义单位，比如rem。

No files or tests are named in the issue. Start by locating the TypeScript configuration and styling entry points that define font sizes and spacing, then check how numeric values are validated or rendered. Done means these properties accept custom units such as rem without breaking existing numeric values, with coverage for both forms.

Written by the indexing model from the issue text.