New layout for public collections

Editing a collection, you can now give each link its own look:

:triangular_ruler: List or mosaic — choose how your public collection appears: the bento-style mosaic (with each link's showcase) or the classic simple list. Your call, per collection.

:frame_with_picture: GIF per link — paste a Giphy page link, a direct GIF URL, or the whole embed code. We extract the right GIF automatically, no need to hunt for the URL yourself.

:art: Solid color or featured spot — pick a background color for a link's card, or mark it as featured to give it more room on the public page.

:eye: One-click preview — a new button next to "Copy link" opens your public page in another tab, so you see exactly what visitors see.