fix(peipei): UF overlay fade 前激活 Sprite

fade in 时启用 overlay GameObject，fade out 完成后隐藏。

Co-authored-by: Cursor <cursoragent@cursor.com>

Assets/Scripts/MiniGame/Peipei/Eye/EyeTargetVisual.cs

@@ -208,7 +208,19 @@ namespace AibisDream
                 return;
             }
 
+            alpha = Mathf.Clamp01(alpha);
+            if (alpha > 0f)
+            {
+                imageSpriteRenderer.gameObject.SetActive(true);
+                imageSpriteRenderer.enabled = true;
+            }
+
             imageSpriteRenderer.SetAlpha(alpha);
+
+            if (alpha <= 0f)
+            {
+                imageSpriteRenderer.gameObject.SetActive(false);
+            }
         }
 
         public Tween TweenImageAlpha(float alpha, float duration)
@@ -218,7 +230,21 @@ namespace AibisDream
                 return null;
             }
 
-            return imageSpriteRenderer.DOFade(alpha, duration);
+            alpha = Mathf.Clamp01(alpha);
+            if (alpha > 0f)
+            {
+                imageSpriteRenderer.gameObject.SetActive(true);
+                imageSpriteRenderer.enabled = true;
+            }
+
+            return imageSpriteRenderer.DOFade(alpha, duration)
+                .OnComplete(() =>
+                {
+                    if (alpha <= 0f && imageSpriteRenderer != null)
+                    {
+                        imageSpriteRenderer.gameObject.SetActive(false);
+                    }
+                });
         }
 
         public void SetUfWeights(float ascii, float dream, float memory)