refactor: small changes from PR review

lib/accounts/user.ex

@@ -190,8 +190,9 @@ defmodule Mv.Accounts.User do
         changeset
         |> Ash.Changeset.change_attribute(:oidc_id, oidc_id)
         # Update email if it differs from OIDC provider
+        # change_attribute/3 already checks if value matches existing value
         |> then(fn cs ->
-          if new_email && to_string(cs.data.email) != new_email do
+          if new_email do
             Ash.Changeset.change_attribute(cs, :email, new_email)
           else
             cs