Add initial implementation of game mechanics and resources management

Scenes/Main/MiraclePanel.cs

@@ -0,0 +1,61 @@
+using System.Collections.Generic;
+using Godot;
+using ParasiticGod.Scripts.Core;
+using ParasiticGod.Scripts.Singletons;
+
+namespace ParasiticGod.Scenes.Main;
+
+public partial class MiraclePanel : GridContainer
+{
+    [Export] private PackedScene _miracleButtonScene;
+    
+    public override void _Ready()
+    {
+        GameBus.Instance.MiraclesUnlocked += OnMiraclesUnlocked;
+        GameBus.Instance.MiracleCompleted += OnMiracleCompleted;
+    }
+
+    public override void _ExitTree()
+    {
+        GameBus.Instance.MiraclesUnlocked -= OnMiraclesUnlocked;
+        GameBus.Instance.MiracleCompleted -= OnMiracleCompleted;
+    }
+
+    public void PopulateInitialButtons(Dictionary<string, MiracleDefinition> miracles)
+    {
+        foreach (var miracle in miracles.Values)
+        {
+            if (miracle.UnlockedByDefault)
+            {
+                AddButtonForMiracle(miracle);
+            }
+        }
+    }
+
+    private void OnMiraclesUnlocked(List<MiracleDefinition> miracles)
+    {
+        foreach (var miracle in miracles)
+        {
+            AddButtonForMiracle(miracle);
+        }
+    }
+
+    private void OnMiracleCompleted(MiracleDefinition miracle)
+    {
+        foreach (var child in GetChildren())
+        {
+            if (child is MiracleButton button && button.GetMiracle() == miracle)
+            {
+                button.QueueFree();
+                break;
+            }
+        }
+    }
+    
+    private void AddButtonForMiracle(MiracleDefinition miracle)
+    {
+        var buttonInstance = _miracleButtonScene.Instantiate<MiracleButton>();
+        buttonInstance.SetMiracle(miracle);
+        AddChild(buttonInstance);
+    }
+}