precache built its resizedItem without setting square, so it warmed
h-<hash>.<size>.false.<quality>. The list surfaces - album grid, artwork avatars,
playlist and radio details - all request square covers, so the warmed entry was
never read and every grid cover stayed a cold miss on first view.
Set square on the precache item so the key matches the request path. The existing
specs asserted the '.300.false.' key and were updated accordingly.
0ce5bd4148