dashboard: make prefs style more specific

The more-general version hit some details elements elsewhere, such as
the user assignment UI.

This also improves the margin consistency in the open/closed states.
Add option to notify users of their own web activity

Ref: ~sircmpwn/todo.sr.ht#94
Omit description from tracker search
Allow long tracker/ticket slugs to break

Ref: ~sircmpwn/sr.ht#245
alpine.yml: reboot -webhooks on deploy
Add core.sr.ht webhook cascades to webhook tables
Further fixes to Sender header syntax
Fix Sender email header syntax
Use last event when editing a comment, not only
Free labels tab from its internal menu
Wrap ticket title in event lists
Don't link to create a label if the user wouldn't be able to

I'd misread the permission hierarchy the first time and assumed that if
user can manage, they can also add a label
.builds/alpine.yml: take three
.builds/alpine.yml: fix variable expansion
.builds/alpine.yml: increase specificity of sed
todosrht-lmtp: allow command without comment
tracker summary: update permissions notice

ref ~sircmpwn/todo.sr.ht#227
Fix notification emails
Correctly scroll down to the new comment after posting

I was redirected to
after posting, whereas the correct URL is
Scroll down to the comment preview when previewing a comment
Don't hide settings tab on narrow screens

Ref: ~sircmpwn/sr.ht#179