🐞 `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.

Written by the indexing model from the issue text.