[Feature]: Round corners for images
### What's the feature?

I would like to be able to add round croners to images. Even nicer if the radius would be selectable/ offer choices.

![Image](https://github.com/user-attachments/assets/402f3a91-e366-46c7-85a0-3eeea4e8d7de)

### Where would you like this feature?

The tldraw.com website

### Contact Details

_No response_

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct