[Feature Request] Support for string literals as `list-style-type`

## Use case I want to customize lists using the `list-style-type` attribute. Currently, this breaks the rendering. | HTML | Flutter package | | -------- | ------- | | <img width="108" height="42" alt="Image" src="https://github.com/user-attachments/assets/9096b414-bf88-41a0-9486-f78dc8ab8520" /> | <img width="111" height="22" alt="Image" src="https://github.com/user-attachments/assets/2bd8df24-ac4f-4b6c-a67f-c398ef36e3e4" /> | ## Proposal I would like the possibility to use `list-style-type` to customize the appearance of lists. ``` css style="list-style-type: &quot;① &quot;" ```