Allow data editing for & responses to support tickets

Done:
~~figure out why email live queries are so slow... (is it doing polling for some reason?)~~
~~and figure out how to get replies from the khe server recognized as such by outlook/gmail/etc~~
~~reset message fields after sending one (quill controlled component complications?) (subject line does not even update when switching threads 😅)~~
~~html from received incoming emails seems to get escaped somehow~~
~~received messages populated from live queries seem not to ever get marked as read; does that only happen when switching to specific threads? it could happen in the initial useEffect for the displayEmail component, right?~~
~~add links to message alerts~~
~~scroll to bottom of thread upon navigating to it~~
~~add badge to support tickets tab itself~~
~~and allow the rest of the support ticket fields to be edited~~

Do someday:
add loading spinner for sending emails - ideally would be able to get "outbox" status from sendgrid
add "references" headers to alerts
add ability to manually create new ticket from support ticket page - this would be the only way to send emails to a new address as things stand
handle attachments.
quotes in replies...

test all of the above.