Somewhat working indicators

Assets/Scripts/PuzzleS/IPuzzlePrompt.cs

@@ -8,6 +8,16 @@ namespace PuzzleS
     /// </summary>
     public interface IPuzzlePrompt
     {
+        /// <summary>
+        /// Called when the prompt should be initially shown (e.g., when step is unlocked)
+        /// </summary>
+        void OnShow();
+        
+        /// <summary>
+        /// Called when the prompt should be hidden (e.g., when step is locked)
+        /// </summary>
+        void OnHide();
+        
         /// <summary>
         /// Called when the player enters the outer range of the prompt.
         /// </summary>