Initial support for blocking cards on Google Desktop

[aug-dev]

Summary

This PR begins to implement a feature requested on #427, adding support for blocking the middle card on Google Desktop's card layout.

Further Explanations

Since this is my first PR that introduces actual code, I thought it would be a good idea to keep things simple.

This is an initial implementation that currently only supports the medium-sized card (on the right half of the screen).

There are still things to add (e.g. support for the title parameter).

I tested both on Firefox and Chromium, and no issues were found.

There seems to be an issue when running pnpm check that leads to an error, but after looking into it, I'm pretty sure that it has nothing to do with the changes made by this pull request.

Demo

demo.webm

P.S. I'm willing to add full support for this card layout.