Add Active Buffs management and UI integration

Scripts/ActiveBuffsManager.cs

@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using Godot;
+using ParasiticGod.Scripts.Core;
+using ParasiticGod.Scripts.Core.Effects;
+using ParasiticGod.Scripts.Singletons;
+
+namespace ParasiticGod.Scripts;
+
+[GlobalClass]
+public partial class ActiveBuffsManager : Node
+{
+    [Export] private PackedScene _activeBuffScene;
+    
+    private readonly Dictionary<Guid, ActiveBuffUi> _activeBuffUis = new();
+    
+    public override void _Ready()
+    {
+        GameBus.Instance.BuffAdded += OnBuffAdded;
+        GameBus.Instance.BuffRemoved += OnBuffRemoved;
+    }
+
+    public override void _ExitTree()
+    {
+        if (GameBus.Instance == null) return;
+        GameBus.Instance.BuffAdded -= OnBuffAdded;
+        GameBus.Instance.BuffRemoved -= OnBuffRemoved;
+    }
+
+    private void OnBuffAdded(Buff buff)
+    {
+        var buffInstance = _activeBuffScene.Instantiate<ActiveBuffUi>();
+        AddChild(buffInstance);
+        buffInstance.SetBuff(buff);
+        _activeBuffUis.Add(buff.Id, buffInstance);
+    }
+
+    private void OnBuffRemoved(Buff buff)
+    {
+        if (_activeBuffUis.TryGetValue(buff.Id, out var buffUi))
+        {
+            buffUi.QueueFree();
+            _activeBuffUis.Remove(buff.Id);
+        }
+    }
+}