A results screen that offers "Up next: <song> — starting in 10s" needs to
know WHAT follows without reaching into queue internals. peekNext() returns
{filename, index, total} for the next track (null when nothing follows),
pure — peeking never plays or mutates.
First consumer: the note_detect results card's queue-advance strip (the
"Playlist Play All has no way to progress" tester issue).
Claude-Session: https://claude.ai/code/session_01Nm7tHs1Yvjjtnnu4nzJgdN
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
