- Policy tests: use Fixtures where applicable; create_custom_field() fix in custom_field_value.
- Replace unused actor with _actor, remove unused alias Accounts in policy tests.
- profile_navigation_test: disable Credo for intentional TODO comment.
- ConnCase: add :read_only and :normal_user role tags for tests.
- Add CheckPagePermission plug tests (unit + integration for member, read_only,
normal_user, admin). Update permission_sets_test (refute "/" for own_data).
- Profile navigation, global_settings, role_live, membership_fee_type: use
users with role for "/" access; expect redirect for own_data on /settings
and /admin/roles.
