Markdown Rendering Needs Love

[bitnom]

I got markdown rendering working in my chat app. It's missing stuff. I'll submit a PR as long as you guys are cool with gpt-5.5 xhigh PR. Will iterate PR if manual review. I don't do slop.

#11158

[ogoffart]

Code made with assistance of LLM is fine as long as we keep the human in the loop and you understand what you are submitting.

Note that the master branch already has API to parse markdown at runtime from the native language.

What extra feature do you have in mind?