Add a `layout` prop ("standard" | "compact") to SoamesGalleryMenu, read from
the block's `data-layout`. Standard (default) = 3 items per row (col-lg-4);
compact = 4 items per row (col-lg-3). Re-enable flex-wrap on the gallery's
media-container-row at >=992px so cards wrap into rows.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>