Step 7: ChessViewModelNew.kt - Slim Android ViewModel (~130 lines)
- Delegates all business logic to ChessLobbyLogic
- Exposes StateFlows from logic.state
- Platform adapter creation only
Step 8: DesktopChessViewModelNew.kt - Slim Desktop ViewModel (~120 lines)
- Same pattern as Android, delegates to ChessLobbyLogic
- UserMetadataCache for profile display
- External CoroutineScope injection
Step 9: ChessBroadcastBanner.kt - Shared Compose banner in commons
- Uses ChessBroadcastStatus from ChessLobbyState
- Works on both Android and Desktop via Compose Multiplatform
- Shows broadcasting progress, sync status, errors
Step 10: UI consumers ready for migration
- New ViewModels use ChessChallenge (enriched display data)
- Shared banner ready to replace Android-only ChessStatusBanner
- Existing screens continue to work with old ViewModel
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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