All these .device rules probably need to be scoped to lists inside PHUIObjectBoxView or something like that?

To be less vague about this:

• Unifying these styles means dropdown menus look odd on mobile. They're still usable, but they pick up padding and borders which are worse on the balance than the old look was. The next rule also has to overwrite a coarse display: none to get them to work.
• I think the right fix here is to make these rules more granular, and target them to action lists inside PHUIObjectBoxView or similar. I'm not making this fix now because (a) I'm not certain it's right; (b) these diffs are already pretty large; (c) I was frustrated enough about spending like two days rewriting dropdown menus without digging into this too; and (d) as far as I know, everything is usable as is, it's just not very pretty.
• My ideal resolution here is for @chad to refine these styles so they apply appropriately and send me a diff, which will probably mostly be adding .phui-box-view in the middle of some of these rules. Alternatively, I can take a stab at this, but it would be a big help if you could do it and you might want to tweak some of the other stuff I did anyway. The menus are a bit iffy right now but I don't think there's so bad that this represents a big bad-faith punt on my part or anything.