Music on iPhone: keep 3-5 songs ready (size-capped), skip a song that will not load instead of sticking on Buffering, tidy the album buttons, lock-screen art in more sizes, and accept the lookups and song-cache settings on the server

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UaC9HmtHMdRP8dAbN4wAKj

README.md

@@ -112,6 +112,11 @@ It listens to the sound the browser is playing. Where it cannot (iPhone Safari,
 - **Continue reading:** Home lists the ebooks you have started, with progress, next to Continue watching and Continue listening.
 - **Privacy:** Settings, Connections has a switch for looking up lyrics and song covers online. Off keeps the artist and title from LRCLIB and iTunes; radio then shows the station logo only.
 
+## Music on a phone
+
+- **Songs kept ready:** the song playing and the next few (3 to 5, set in Settings under Connections) are saved on the device while you listen, up to about 120 MB, so changing songs is instant and a weak signal does not stop the music.
+- **A song that will not play** is tried once through Plex's converter, then skipped with a message, instead of leaving the player stuck on "Buffering".
+
 ## Install on iPhone / iPad (PWA)
 
 Open the site in **Safari** (it must be the `https://` address), tap **Share -> Add to Home Screen**. The home-screen app has proper