Function useHighscores

Returns {
    getLeaderboard: (app: string) => Promise<LeaderboardEntry[]>;
    submitScore: (app: string, score: number) => Promise<void>;
}

• getLeaderboard: (app: string) => Promise<LeaderboardEntry[]>

• submitScore: (app: string, score: number) => Promise<void>

  Fire-and-forget: a failed submit must never block the game-over screen.