Add backbone for card creation and implement Camera minigame mechanics

Assets/Scripts/UI/CardSystem/UIPage.cs

@@ -0,0 +1,92 @@
+using System;
+using UnityEngine;
+
+namespace AppleHills.UI.CardSystem
+{
+    /// <summary>
+    /// Base class for UI pages that can transition in and out.
+    /// Extended by specific UI page implementations for the card system.
+    /// </summary>
+    public abstract class UIPage : MonoBehaviour
+    {
+        [Header("Page Settings")]
+        public string PageName;
+        
+        // Events using System.Action instead of UnityEvents
+        public event Action OnTransitionInStarted;
+        public event Action OnTransitionInCompleted;
+        public event Action OnTransitionOutStarted;
+        public event Action OnTransitionOutCompleted;
+        
+        // Default duration for transitions
+        [SerializeField] protected float transitionDuration = 0.3f;
+        
+        // State flags
+        protected bool _isTransitioning = false;
+        protected bool _isVisible = false;
+
+        /// <summary>
+        /// Called when the page is shown. Handles the transition in animation.
+        /// </summary>
+        public virtual void TransitionIn()
+        {
+            gameObject.SetActive(true);
+            _isTransitioning = true;
+            OnTransitionInStarted?.Invoke();
+            
+            // Override in child classes for specific transition animations
+            DoTransitionIn(() => {
+                _isTransitioning = false;
+                _isVisible = true;
+                OnTransitionInCompleted?.Invoke();
+            });
+        }
+
+        /// <summary>
+        /// Called when the page is hidden. Handles the transition out animation.
+        /// </summary>
+        public virtual void TransitionOut()
+        {
+            _isTransitioning = true;
+            OnTransitionOutStarted?.Invoke();
+            
+            // Override in child classes for specific transition animations
+            DoTransitionOut(() => {
+                _isTransitioning = false;
+                _isVisible = false;
+                OnTransitionOutCompleted?.Invoke();
+                gameObject.SetActive(false);
+            });
+        }
+
+        /// <summary>
+        /// Called when the back button is pressed while this page is active.
+        /// Default implementation pops the page from the stack.
+        /// </summary>
+        public virtual void OnBackPressed()
+        {
+            if (!_isTransitioning)
+            {
+                UIPageController.Instance.PopPage();
+            }
+        }
+        
+        /// <summary>
+        /// Implement transition in animation in child classes.
+        /// </summary>
+        protected virtual void DoTransitionIn(Action onComplete)
+        {
+            // Default implementation - instant transition
+            onComplete?.Invoke();
+        }
+        
+        /// <summary>
+        /// Implement transition out animation in child classes.
+        /// </summary>
+        protected virtual void DoTransitionOut(Action onComplete)
+        {
+            // Default implementation - instant transition
+            onComplete?.Invoke();
+        }
+    }
+}