Images - support for Scryfall WEBP , Maybe add AVIF too for future ?

I just notice that Scryfall uses `.webp`, then I check new card and some old scan, it was pretty much -50% in KB for 2 cards I did look up (`voc-99-swords-to-plowshares` `msc-37-professor-hulk`). Picture quality was pretty 98% same
Last time when I ask about the top quality PNG, you were talking about file size, this would probably make it -40% for whole image gallery (mine is 20GB now, so 10-12GB if I would use WEBP)
and why not add support for AVIF while you add WEBP, there are few websites who use it nowadays.

Start by tracing the Java client path that loads and displays Scryfall card images, since the issue names no files or tests. Check the two referenced cards, voc-99-swords-to-plowshares and msc-37-professor-hulk, and determine how image formats are currently handled. Done should be defined as reliable support for WEBP, with AVIF scope confirmed separately.

Written by the indexing model from the issue text.