Keep played board visible during results

[kevinatlee]

Summary

• keep the authoritative finished board frozen above the existing player results summary
• place the controller Return to Lobby action between the frozen board and the “Look at the TV!” summary
• use a server-authoritative 30-second results/review window
• top-align TV/display results content to recover vertical space, especially for two-row scoreboards
• preserve existing responsive player widths and display card-column behavior

Validation

• exact-head PR CI passed
• exact-head test-image publication passed and produced matching immutable/mutable test tags
• physical phone/TV testing approved

Ready for squash merge to main.