The 1461x720 webp downscales badly to 24 px (sidebar strip) and 72 px (signin
header) — browser is doing a ~60x reduction and the thin wing lines turn to
mush. Pre-crop around the icon's content bbox, make it square with a small
breathing margin, resize to 128 px and 256 px, drop transparency on the dark
backdrop. Addon manifest icon is the 128 PNG as a data URI (16 KB vs the
26 KB uncropped webp), and the panel pulls mark-128.png / mark-256.png at
the two sizes it needs. Also home.html's Hermes.X tile now points at the
cropped PNG so the home card isn't blurry.
Version bumped to 0.2.3 so seedBundledAddons picks it up on a release
bundle swap. The installed bundle + user-data cache were hot-patched
too so the fix is visible immediately in the running app.