Origin Ghost Player v0.2.0

Adds auto-focus: OriginPlayer now picks up whatever's playing through the bridge automatically,
instead of needing a manual reselect in OriginOS's own widget picker every time playback starts
fresh or a native app (Spotify, etc.) takes the widget over.

Turns out OriginPlayer's takeover trigger is keyed on real audio output, not the MediaSession or a
posted notification. On picking up a new source, the app now briefly plays a genuinely silent
AudioTrack — deliberately without ever requesting audio focus, so there's no
focus-arbitration event and nothing audible happens to the real app — purely to register as active
audio output. Verified with no audible glitch.

See docs/DEV.md for the full
writeup of how this was tracked down.