If you want a frontend for you app, you probably just use Electron and get it over with in a few minutes instead of digging through the docs for Qt or some other framework.
Is it worth it? Probably not, since this is a single-platform app to start with, but JS+HTML are easy to theme and customize, and Qt is... not quite as simple.
Where did you get Qt from? This is, again, a Mac-only app that doesn’t even have any windows. It’s just a menu bar icon and a notification. That’s incredibly simple to build with plain old Cocoa and Swift.
No one has to dig through electron docs though right? There is nothing simple about an electron app regardless how little logic you personally programmed on top of it.
Now that you can build such an app with AI in under 20 minutes with a manageable codebase you can properly understand and control, I don't think that's a good excuse anymore
Is it worth it? Probably not, since this is a single-platform app to start with, but JS+HTML are easy to theme and customize, and Qt is... not quite as simple.