android: the library's file stats on the cards, the artist's own plays, the thumbnail prewarm

The desktop Library's per-record file stats on the phone (library_album_stats,
one call for the whole library): FLAC 24/96 or MP3 320k badges on the cards,
the size on the list rows and the record page. The artist page's own
listening (artist_play_stats): the time played as a chip, the most played
track under "On this phone". The whole-library thumbnail warm a moment after
boot, at the cards' edge, one decode at a time behind the tiles' gate.

ANDROID.md

@@ -208,8 +208,14 @@ Library clears the play history behind a confirm. The now-playing
 sheet's ⋯ on a streamed track is the desktop's
 Save menu: Save to library (at once when the cache is byte-complete, else
 through the download pipeline) and Save this record for the streamed
-record the queue holds. Search corrects an obvious misspelling from the
-names this phone knows (the library, the searches that worked) — the desktop's rule,
+record the queue holds. A moment after boot the phone warms the library's thumbnails the
+desktop's way (`library_art_prewarm` at the cards' edge, one decode at a
+time behind the tiles' gate). The Library's cards wear the desktop's file stats (`library_album_stats`,
+one call for the whole library: FLAC 24/96, MP3 320k, the size on the
+list rows and the record page), and the artist page shows this phone's
+own listening (`artist_play_stats`: time played as a chip, the most
+played track under "On this phone"). Search corrects an obvious
+misspelling from the names this phone knows (the library, the searches that worked) — the desktop's rule,
 a word only when a real name is within two edits.
 
 ## Playlists