Fix memory leaks, stale game data, and audio volume fluctuation

Memory: clean observers even during PiP, nil player on tile disappear,
track/cancel Werkout monitor tasks, add highlight player cleanup.
Data: add scenePhase-triggered reload on day change, unconditional
10-minute full schedule refresh, keep fast 60s score refresh for live games.
Audio: set mute state before playback starts, use consistent .moviePlayback
mode, add audio session interruption recovery handler.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

mlbTVOS/Views/SingleStreamPlayerView.swift

@@ -583,11 +583,11 @@ struct SingleStreamPlayerView: UIViewControllerRepresentable {
 
     static func dismantleUIViewController(_ uiViewController: AVPlayerViewController, coordinator: Coordinator) {
         logSingleStream("dismantleUIViewController start isPiPActive=\(coordinator.isPiPActive)")
+        coordinator.clearDebugObservers()
         if coordinator.isPiPActive {
-            logSingleStream("dismantleUIViewController skipped — PiP is active")
+            logSingleStream("dismantleUIViewController — PiP active, observers cleared but keeping player")
             return
         }
-        coordinator.clearDebugObservers()
         uiViewController.player?.pause()
         uiViewController.player = nil
         logSingleStream("dismantleUIViewController complete")