* Implement PoC for email reverification flow on update

* Improve user settings form and email change validation

* Expose `previous_email` in Kaffy CRM

* Improve plugs setup and remove dead action from AuthController

* Fix seeds

* Extract predicate query functions from AuthController

* Add tests

* Update CHANGELOG.md

* Rename `has_any_sites?` to `Memberships.any?` and `has_any_memberships?`

* Improve flash message on cancelling email change

* Cover one more test case for email update