fix(ios): sync player state on audio session interruptions

[tobyt42]

iOS pauses AVPlayer automatically on interruption (phone calls, Siri, other apps taking audio focus) without updating playWhenReady, leaving the state machine stuck on .playing and the UI showing a stale pause button. Observe AVAudioSession.interruptionNotification to sync state to paused on interruption begin, and reactivate the session and resume playback on interruption end when the system reports shouldResume.

[puckey]

Thanks, this is indeed a gap on main and your diagnosis is right.

However, the native player overhaul in #51, landing in the coming weeks, already includes interruption handling, with a couple of extra edge cases: it captures play intent at .began (so we don't resume after a call if the user had already paused. This PR's unconditional play() on shouldResume would), and it ignores iOS 17 .routeDisconnected interruptions since the route-change observer handles those.

So I'll hold this PR and close it once #51 merges. Thanks again for the report and fix!