Share pill
A light pill of overlapping faces and a Share button. Press it and the same pill grows in place into the sheet: a copy-link row whose icon turns into a drawn check, an "Invite by email" field that opens inline (a bad address shakes it), and a view / edit switch for anyone with the link.
Share pill is part of Pro.
Get Pro to try it live and copy its code, along with every other element in the library.