- Added mentions support in end‑to‑end encrypted rooms and a setting to disable email two‑factor authentication for OAuth users.
- Enhanced admin controls with department‑unit association, visitor‑finish‑conversation option, side‑panel navigation preview, and feature‑preview management view.
- Introduced new APIs/endpoints (teams.listChildren, contacts.update/create, email sending via apps) and fixed numerous bugs such as unread‑room marking, message parser, email validation, and outgoing‑webhook handling.