bug: all notifications used tag='hyperhive', so each new fire
replaced the previous — operator only ever saw one at a time and
might miss the fact that a second arrived. now per-event tags
(hyperhive:approval:<id>, hyperhive❓<id>,
hyperhive:msg:<at>:<rand>) so distinct events stack in the OS
notification center.
dropped the bogus icon (was pointing at dashboard.css) — some
browsers refuse to display a notification with an invalid icon.
added console.debug at every block point (not supported, permission
not granted, muted) and a 'shown' log on success, so the operator
can see in the browser console exactly why a notification didn't
fire.
note for the operator: most browsers also suppress notifications
while the originating tab is FOCUSED. that's a browser-level
decision, not ours.
3b532753b3