[tooltips] inconsistent tooltips

[beets]

Our tooltips look different on every tool / surface. We should bring consistency to their look and feel across the site.

Some ideas and requirements: https://docs.google.com/document/d/1yDIkORJGukpHrzM6xzCYV0ufQPnE7CgRsf2eJdwJl_I/edit#heading=h.6ph5o7lhkalw