can't reinvite

so I accidentally clicked uninvite(?) and now I can't reinvite the same person I get a `You already invited user@example.com, once upon a time.`

Start by reproducing the invite, uninvite, and reinvite flow described in the issue and inspect where the “You already invited” message is produced. Confirm the expected behavior for reinviting the same person, then add coverage for the corrected flow and verify the original error no longer occurs.

Written by the indexing model from the issue text.