Interacting with actions located in menus was broken in a few different

ways on mobile. Some of these problems were baked into the menu

implementation from the very beginning, and some are a bit more recent.
To fix these issues, this change does several things:

Hidden menus were being set to have visibility: hidden and

opacity: 0, but this still can allow them to be interacted with.

  When in mobile mode, various action menus would overlap, so a click on

  something in the "Review" menu was accidentally activating things in

  the "Close" menu.
Interaction with a lot of the menus relied entirely on the :focus

  and :hover states. This kind of worked sometimes with the way that

  mobile browsers deal with touch events, but it wasn't reliable, and

  barely worked at all with mobile mode in desktop browser devtools.

  I've added explicit touch event handlers to improve the interaction.
The "Review" menu in particular is very modal, and takes up a lot of

  the screen when working on mobile. I've added an event overlay over

  the rest of the page so that taps outside of the menu area will

  dismiss the menu.

Exercised all of the menus and actions using both mobile and desktop

  modes.
Ran python tests
Ran js tests