.validate-required is on every required checkout field, so the old selector's
first match was usually a text input, and on the terms row the click landed in
the empty half of a full-width <p> beside the box. Target the checkbox input in
a required row and gate on :not(:checked) so the two clicks tick box one then
box two instead of toggling the same box twice; the second is skipIfNotFound in
case a checkout has only one.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
