The channel avatar (and video thumbnails) are yt3.googleusercontent.com /
i.ytimg.com URLs; hotlink/CORS policy could blank them (failed <img> hides on
the watchlist, falls to initials on the wishlist orb) — which is why the poster
'vanished' on both pages.
Extend the /api/video/img proxy allowlist to YouTube CDN hosts (ytimg.com /
ggpht.com / googleusercontent.com, https-only, still SSRF-safe) and route all
YouTube art through it: VideoYoutube.img() helper used by the watchlist channel
cards, search chip, the wishlist nebula orb/season/still art, and the channel
detail avatar/banner/thumbnails. 2 img-proxy tests green; JS balanced.
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