Align chat rendering with VSCode's KaTeX support

I’d like to suggest an improvement to the chat panel’s rendering capabilities.

My suggestion is to enable KaTeX rendering for mathematical expressions, which would align the chat’s behavior with VSCode’s Markdown preview. The key benefit would be seeing text in $ and $ rendered as formatted equations.

This would be a massive help for the clarity of any technical discussion involving formulas.

Thanks for all your work on this great tool.