Take screenshots during play mode

[sjiwoo]

Requesting a screenshot feature so that LLMs can compare the play mode result visually to what is expected for debugging

[Scriptwonder]

This should be achieved by #449! Right now, you can ask LLM to generate a screenshot, but I guess I am not directly tackling your problem, which is to integrate this generated screenshot into the debugging workflow. Some solutions:

1. If you are using a more integrated LLM like Claude Code that can directly access the photo, it should be working fine.
2. Right now MCP generate the captured screenshot in the Screenshot folder, so you can manually drag it into the LLM you are using, which is very easy and save a lot of token if we were to send to LLM as a response everytime with the screenshot.

Let me know what you think! I will close this once the PR is merged.