Add dropdown menu from bookmark label clicks

[cmdcolin]

Adds the ability to 'open bookmark widget' and 'remove bookmark'

[carolinebridge]

You get a bit of a weird effect when you're zoomed out with some of the styling that was changed

branch:

main:

Before the label icon buttons were inaccessible at a far zoom, but unobtrusive.

I don't personally mind the change if that was an intentional preference.

[cmdcolin]

ah no that was unintentional. it is a little debateable whether it might still be good to be clickable or something when zoomed out, but i restored the overflow:hidden for now

[cmdcolin]

thanks for catching that!