Image diffs

[tjuranek]

Prerequisites

• I have searched for duplicate or closed feature requests
• I have read the contributing guidelines

Proposal

I'd like to see image diffs be supported. Support for new, deleted, or changed image files.

Motivation and context

I'm an OpenCode user and see this package is used in the web ui. I'll often have Playwright screenshot something and I'd like to be able to see those screenshots as I'm reviewing output.