alt Hacker NewsBuild it on Retroarch and you don’t even need X/Wayland. And the menu/launching functionality is done, you’d just be making a theme for it.
Really if someone made a WebKit “core” and a Jellyfin client “core” (which, actually, you might get “for free” with the browser if you can tolerate web bloat on your platform) under libretro it’d be a pretty damn capable set-top-box UI. All the “cores” right now are games/emulators, but they don’t have to be.
This is a very interesting take -- I wonder how it would deal with web browsers? I'm curious because I actually did try to add firefox to my Steam Deck as a "game" and it couldn't deal with multiple windows?