- Dual mode (separate video + audio, used by adaptive streams and the iPhone EQ
copies): going to the background now makes the audio the master, so progress,
Now Playing and auto-advance keep working while iOS has the video suspended
(the paused video used to be the only source of "ended", so playback stopped
after the current song). The picture is re-synced on return.
- A track that starts while the app is in the background (auto-advance, the
lock-screen Next button) starts as audio — iOS will not start a <video> there —
and gets its picture back at the same position when the app returns.
- The handoff also runs on pagehide and when iOS pauses the master video while
the page is hidden, for when visibilitychange arrives too late.
- Classic: playlist cards place their three actions as a 2x2 block (note + add
on top, remove below) instead of the note button wrapping to the bottom-left.
- Save to this device: hide the full progress bar once the file is ready; it
read as a squashed, broken button above "Save to Photos / Files".
