This creates a placeholder box — the actual working tool gets wired in once it's built.

This creates a new, separate lead-owner identity that signs in using the same login.

First create their login in Supabase → Authentication → Users → Add user, then link them here by that same email.

Tick View to let this login see a screen, Edit to also let them create/change within it, and Delete to let them remove records. Delete follows Edit until set explicitly. This overrides the role default until reset.