Group 1 — per-email view actions:
Open in new tab → Mark Unread/Read → Remind to reply
Group 2 — non-destructive state changes:
Save sender to contacts → Done/Not Done → Archive
Group 3 — destructive (own divider):
Move to Spam → Move to Trash → Delete Permanently
Adds support for { separator: true } items in the actions array,
rendered as .dropdown-divider rows.
7c1af0385a