refactor

scripts/State/PlayerState.cs

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+using System.Collections.Generic;
+using Mr.BrickAdventures.scripts.Resources;
+
+namespace Mr.BrickAdventures.scripts.State;
+
+/// <summary>
+/// Persistent player data that survives across sessions.
+/// This is a POCO (Plain Old C# Object) for predictable state management.
+/// </summary>
+public class PlayerState
+{
+    /// <summary>
+    /// Saved coins (not including current session).
+    /// </summary>
+    public int Coins { get; set; }
+
+    /// <summary>
+    /// Remaining lives.
+    /// </summary>
+    public int Lives { get; set; } = 3;
+
+    /// <summary>
+    /// Indices of completed levels.
+    /// </summary>
+    public List<int> CompletedLevels { get; set; } = new();
+
+    /// <summary>
+    /// Indices of levels the player can access.
+    /// </summary>
+    public List<int> UnlockedLevels { get; set; } = new() { 0 };
+
+    /// <summary>
+    /// Skills the player has permanently unlocked.
+    /// </summary>
+    public List<SkillData> UnlockedSkills { get; set; } = new();
+
+    /// <summary>
+    /// Statistics dictionary for tracking game stats.
+    /// </summary>
+    public Dictionary<string, int> Statistics { get; set; } = new();
+
+    /// <summary>
+    /// IDs of unlocked achievements.
+    /// </summary>
+    public List<string> UnlockedAchievements { get; set; } = new();
+
+    /// <summary>
+    /// Creates a fresh default player state.
+    /// </summary>
+    public static PlayerState CreateDefault() => new()
+    {
+        Coins = 0,
+        Lives = 3,
+        CompletedLevels = new List<int>(),
+        UnlockedLevels = new List<int> { 0 },
+        UnlockedSkills = new List<SkillData>(),
+        Statistics = new Dictionary<string, int>()
+    };
+
+    /// <summary>
+    /// Resets this state to default values.
+    /// </summary>
+    public void Reset()
+    {
+        Coins = 0;
+        Lives = 3;
+        CompletedLevels.Clear();
+        UnlockedLevels.Clear();
+        UnlockedLevels.Add(0);
+        UnlockedSkills.Clear();
+        Statistics.Clear();
+    }
+}

scripts/State/PlayerState.cs.uid

@@ -0,0 +1 @@
+uid://gtr1e60jq7iv

scripts/State/SessionState.cs

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+using System.Collections.Generic;
+using Mr.BrickAdventures.scripts.Resources;
+
+namespace Mr.BrickAdventures.scripts.State;
+
+/// <summary>
+/// Data for the current gameplay session.
+/// Reset when player dies or completes a level.
+/// </summary>
+public class SessionState
+{
+    /// <summary>
+    /// Current level index being played.
+    /// </summary>
+    public int CurrentLevel { get; set; }
+
+    /// <summary>
+    /// Coins collected during this session (not yet saved).
+    /// </summary>
+    public int CoinsCollected { get; set; }
+
+    /// <summary>
+    /// Skills unlocked during this session (not yet saved).
+    /// </summary>
+    public List<SkillData> SkillsUnlocked { get; set; } = new();
+
+    /// <summary>
+    /// Creates a fresh session state.
+    /// </summary>
+    public static SessionState CreateDefault() => new()
+    {
+        CurrentLevel = 0,
+        CoinsCollected = 0,
+        SkillsUnlocked = new List<SkillData>()
+    };
+
+    /// <summary>
+    /// Resets session state to defaults.
+    /// </summary>
+    public void Reset()
+    {
+        CoinsCollected = 0;
+        SkillsUnlocked.Clear();
+    }
+
+    /// <summary>
+    /// Resets completely including level.
+    /// </summary>
+    public void ResetAll()
+    {
+        CurrentLevel = 0;
+        CoinsCollected = 0;
+        SkillsUnlocked.Clear();
+    }
+}

scripts/State/SessionState.cs.uid

@@ -0,0 +1 @@
+uid://chqsdleqrnl7b