Add Items Aspect Ratio presets and Original mode CSS

[georgeolaru]

Summary

Add CSS support for the Items Aspect Ratio feature in Cards Collection blocks. Nova Blocks adds a SelectControl with presets (Original, Square 1:1, Landscape 4:3, Portrait 3:4) — Anima provides the CSS that makes each mode render correctly on both frontend and editor.

What this does

Forced aspect ratios (Square, Landscape, Portrait)

• Uses aspect-ratio: var(--nb-card-media-aspect-ratio, auto) on stacked card items
• Scoped to 2+ column grids (excludes full-width hero blocks)
• Editor fix: resets NB's degenerate aspect-ratio formula on the media wrapper (which produces infinity when Minimum Container Height = None)

Original aspect ratio

• Removes the forced aspect ratio so each card's image dictates its own height
• Frontend: Reverses NB's stacked layout — makes media position: static so image height flows naturally, content overlays via position: absolute
• Editor: Overrides NB's deeply nested media chain (blob-mix → blob-mix__mask → blob-mix__media) to let image height flow up

Editor 3D Grid preview

• CSS-only checkerboard approximation using nth-child(even) + transform: scale(0.88)

Files

• src/scss/utility/_items-aspect-ratio.scss (new) — all aspect ratio CSS
• src/scss/utility.scss — imports the new file
• dist/css/utility.css, dist/css/utility-rtl.css — compiled output