Feature Request: Add quick-terminal-background-opacity

[rafaelliu]

As title: support opacity setting specific to quick-terminal.

Premise: quick-terminal use case is slightly different from the full terminal one.

If i'm openning a quick-terminal, I'm in the middle of something and want to quickly execute a command within the context of my current flow. In this case. Having a transparent background can be very useful, both in feel and function.

But if I have a full terminal, I'm focused on what's going on there and my flow is central to it. In this case transparency is actually distracting.

I realize this is a bit of a personal workflow/opinion, but I think the ergonomic principles are general enough that I'd like to propose it. Feel free to