message: Change memorialised preview to be columnar
diff: <ActionCardContainer::Section
  @title="Prepaid card preview"
  >
  - <div class="preview__content" data-test-preview>
  + <div
  + class={{cn "preview__content" preview__content--is-complete=@isComplete}}
  + data-test-preview
  + >
  {{#unless @isComplete}}
  <Boxel::Field
  @label="Card Preview"
  </div>
  </Boxel::Field>
  {{/unless}}
  - <CardPay::FieldStack class="preview__data">
  + <CardPay::FieldStack
  + class={{cn "preview__data" preview__data--is-complete=@isComplete}}
  + >
  <CardPay::LabeledValue
  @vertical={{true}}
  @label="Issued by"
  