The platforms advertise stop, skip forward/backward, and playback-rate
commands by default, but both the music and video handlers silently
dropped them (Android Auto/Bluetooth stop and FF/rewind did nothing;
iOS/macOS showed a dead rate control). setControlsEnabled now manages
those controls: music handles Stop and in-track skips and stops
advertising a speed control; video handles Stop (exit, matching the
companion remote), skips via a shared relative-seek helper, and rate
changes through player.setRate. Skip commands stay off on iOS/macOS
where they would displace the next/previous lock-screen buttons.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
