Enhance the immersion of media viewing in custom environments

WindowGroup {
            ContentView()
                .immersiveEnvironmentPicker {
                    ForEach(viewModel.environmentItems) { item in
                        Button(item.title, image: item.thumbnail) {
                            Task { 
                                await openImmersiveSpace(id: item.id)
                            }
                        }
                    }
                }
        }

import AVKit
import GroupActivities

   for await session in MyActivity.sessions() {
        
        // join the session, activate the activity, etc.

        playerViewController
            .player?
            .playbackCoordinator
            .coordinateWithSession(session)

        playerViewController
            .groupExperienceCoordinator
            .coordinateWithSession(session)
    }