Expose a custom command for opening Markdown files

Discord username (optional)

Integralist

Describe the solution you'd like?

I'd like to be able to run a command like md example.md to view the example.md Markdown in Warp.

Is your feature request related to a problem? Please describe.

There are few frustrations with the feature as it exists today...

1. If the file is long (which for me it is most of the time, i.e. the entire file won't fit on my screen), then I won't see the "View in Warp" link until I've finished scrolling the entire file.
2. It's an extra step and I also have to reach for my mouse to click the "View in Warp" link.
3. I have cat aliased to bat, and so I noticed (see video for context) that if you try and use /bin/cat instead, the link won't show. So I think that Warp is looking for the literal cat in the command prompt (which makes sense as the approach to take, but thought I'd mention it as I still kind of expected /bin/cat to work).

Additional context

https://github.com/warpdotdev/Warp/assets/180050/4b81be68-5c29-4421-bb24-6913fa2abe53

How important is this feature to you?

1 (Not too important)

Warp Internal (ignore) - linear-label:770f6576-d6c0-4e4f-a259-fc64b5156087

None

No file or test is identified in the issue. Start by locating the existing Markdown “View in Warp” handling and the command-parsing entry point, then determine how a command such as md example.md should invoke it. Done means Markdown files can be opened in Warp through the requested custom command.