encounter-card.component rendered the raw 2.39MB ash-rat.png and
2.00MB road-bandit.png directly, up to 3 cards per hunt (~7MB/load,
re-rendered on "Neu suchen"). Add 560px-wide JPEG runtime derivatives
(generated via PowerShell System.Drawing, HighQualityBicubic, quality
82) and switch to the <picture>/<source srcset> pattern already used
by context-panel for location backgrounds, keeping the original PNGs
as the <img> fallback. Also add loading="lazy" decoding="async".
ash-rat.png: 2,506,677 B -> ash-rat-560.jpg: 35,896 B
road-bandit.png: 2,097,049 B -> road-bandit-560.jpg: 50,797 B
833fa52d8d
