🐞 `attribute` missing from themes

### Description

Our themes don't find the `attribute` syntax capture in HTML docs:
```html

```
The `async` and `src` should have highlights, and are being found by tree-sitter but don't have a related color in themes.

### Version Information

CodeEdit: 0.3.1
macOS: 15.1
Xcode: 16.1

Locate the theme definitions and HTML syntax-highlighting configuration responsible for the attribute capture. Check how tree-sitter identifies async and src, then add the missing theme color mapping and verify that both attributes are visibly highlighted in the provided script example.

由索引模型根據 Issue 內容生成。