Usability issues with the (+) button in pages list

[fvsch]

In the current stable admin plugin (for Grav 1.0.10), the (+) button that shows a page’s children in /admin/pages has a few usability issues:

• On hover it uses a text cursor, rather than cursor:pointer or cursor:default, which can make user thinks it’s not a reactive element.
• On hover it shows an information tooltip that has nothing to do with showing/hiding child pages. This also sends the wrong message ("no feature here, don't click").
• It cannot be accessed with the keyboard (it’s currently a <i class="page-icon …"></i>, would benefit from being a <button type="button" aria-label="Show child pages"><i class="page-icon …></i></button>).
• The hitbox for actually clicking the button is too small: 20 by 16px. For an icon-only button, I’d say 24 by 24px is a minimum, but 30px is even better.

[rhukster]

Some legit things here. We'll take a look!

[rhukster]

Fixed in develop