Renders the shared outer shell of a game page.
Includes the background container, visually-hidden heading, PhaseIndicator with
TutorialButton and ManualButton, and end-game overlays (WinCelebration, GameResetDialog).
Game-specific content is rendered via children.
Renders the shared outer shell of a game page. Includes the background container, visually-hidden heading, PhaseIndicator with TutorialButton and ManualButton, and end-game overlays (WinCelebration, GameResetDialog). Game-specific content is rendered via children.