Goal: Persist player name and best score between scenes/sessions; show name + score in Start Menu and Main scene.

Singleton: public static DataHolder Instance { get; private set; } and DontDestroyOnLoad in Awake() so the object persists across scenes.

Fields: playerName, bestScore, bestPlayer, POINTS.

Persistence methods: Save() / Load() using PlayerPrefs for BestScore and BestPlayer.

SetPoint(int): updates POINTS, compares with bestScore, updates bestPlayer and calls Save() when a new best is reached.

Accessors: SetPlayerName(string), GetPlayerName(), GetBestScore(), GetBestPlayer().

Debugging: added logs inside SetPoint to show incoming points, current best, and whether a new best was saved.

Call on GameOver: DataHolder.Instance.SetPoint(m_Points) to notify DataHolder when a run ends.

Fallback fix: replaced an unsafe fallback that accessed DataHolder.Instan