Add a "design mode" feature for markdown previews

Feature request for product/service

Cursor IDE

Describe the request

I would love it if I could highlight a range of text in a markdown file and get the inline chat tooltip (similar to design mode on web pages) so I could chat with specific sections of the document. This would make working on product specs, technical specs, and rfcs much easier.

Right now the select and chat capturing the selected range is hit or miss.

Operating System (if it applies)

MacOS