refactor: Replace hardcoded node paths with constants and remove ScoreComponent.

Autoloads/AchievementManager.cs

@@ -1,5 +1,6 @@
 using Godot;
 using Godot.Collections;
+using Mr.BrickAdventures;
 using Mr.BrickAdventures.scripts.Resources;
 
 namespace Mr.BrickAdventures.Autoloads;
@@ -8,14 +9,14 @@ public partial class AchievementManager : Node
 {
     [Export] private string AchievementsFolderPath = "res://achievements/";
     [Export] private PackedScene AchievementPopupScene { get; set; }
-    
+
     private System.Collections.Generic.Dictionary<string, AchievementResource> _achievements = new();
     private Array<string> _unlockedAchievementIds = [];
     private GameManager _gameManager;
-    
+
     public override void _Ready()
     {
-        _gameManager = GetNode<GameManager>("/root/GameManager");
+        _gameManager = GetNode<GameManager>(Constants.GameManagerPath);
         LoadAchievementsFromFolder();
         LoadUnlockedAchievements();
     }
@@ -44,7 +45,7 @@ public partial class AchievementManager : Node
             fileName = dir.GetNext();
         }
     }
-    
+
     public void UnlockAchievement(string achievementId)
     {
         if (!_achievements.TryGetValue(achievementId, out var achievement))
@@ -75,11 +76,11 @@ public partial class AchievementManager : Node
         {
             SteamManager.UnlockAchievement(achievement.Id);
         }
-        
+
         // 4. Save progress
         SaveUnlockedAchievements();
     }
-    
+
     public void LockAchievement(string achievementId)
     {
         if (_unlockedAchievementIds.Contains(achievementId))
@@ -88,7 +89,7 @@ public partial class AchievementManager : Node
             SaveUnlockedAchievements();
         }
     }
-    
+
     private void SaveUnlockedAchievements()
     {
         _gameManager.PlayerState["unlocked_achievements"] = _unlockedAchievementIds;