Which container owns a card's box on conversion — the icon_box, or its column?
The question: A source "feature card" is a bordered panel (fill + border + radius + padding) holding an
icon, a title and some content. When the deterministic Site Converter reproduces it natively, which
container should carry the box — the icon_box's own Box Style, or the enclosing column's Border
Preset? And should the box be a real Box Preset or a one-off scoped CSS class?
