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/GameCenterView.swift

@@ -69,6 +69,7 @@ struct GameCenterView: View {
                 VideoPlayer(player: player)
                     .ignoresSafeArea()
                     .onAppear { player.play() }
+                    .onDisappear { player.pause() }
             }
         }
     }