Mirrors the LL albums pattern 1:1: artwork migrates from index-keyed
FavoriteAlbum{index} to id-keyed FavoriteAlbumById{id,gen} (re-sort
immune), a FAV_ALBUMS_GEN token guards stale applies, the band from the
windowed grid routes through a thread-local BandDispatcher (180ms
leading+trailing), covers far outside the window evict back to the
placeholder, and list/grouped modes keep full dispatch. The load path
no longer dispatches every favorite cover up front — the first window
report pulls only what is near the viewport.
cc
vicrodh
bf6336cc78