Swipe-to-remove for notifications
Mostly works, I had to reimplement row activation on click though... That doesn't look very fixable in GTK3 without breaking the behavior, though it does just work in GTK4.
There's also no animation after swiping a notification in the list, but that's not really doable with a model.
What do we do with frames containing multiple notifications? Right now it just swipes away the whole frame.