Move save_clipboard into a 0-timeout. Check checkboxes immediately
instead of relying on apply_check_all / update_pagestate to make a
redundant loop through everything.
Following the previous commit about the checkbox on the /photo page,
this fixes all of the code assuming that we're dealing with photo_card
divs, the majority of which was doing nothing but accessing the id.
This was less helpful than expected, because if you take that
tab and navigate somewhere else, then trying to open the clipboard
would replace the current tab instead of opening a new one.
