drop the stray root icon.png
Left by the extraction on 2026-08-19: the old 3.5KB public/slskd.png was copied to the plugin root, which is not a path anything reads. publishAssets copies `assets/` only, so the icon that has always been served is assets/icon.png — now 248KB of real artwork rather than the old logo. Two copies of the same idea, one of them invisible, is how they drift.
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