fix(peipei): UF_spriteIn 从 Yarn 变量解析 EyeTarget

切换 UF 模式后 CurrentTarget 可能为空，回退读取 $currentEyeTarget。

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

Assets/Scripts/MiniGame/Peipei/UF/UFSystem.cs

@@ -62,13 +62,36 @@ public class UFSystem : MonoBehaviour
         eyeSystem?.SetUnifiedUfWeights(0f, 0f, 0f);
     }
 
+    private EyeTarget ResolveSpriteTarget()
+    {
+        if (eyeSystem == null)
+        {
+            return null;
+        }
+
+        if (eyeSystem.CurrentTarget != null)
+        {
+            return eyeSystem.CurrentTarget;
+        }
+
+        if (YarnVariableStorage.Instance != null
+            && YarnVariableStorage.Instance.TryGetValue("$currentEyeTarget", out string targetName)
+            && !string.IsNullOrEmpty(targetName))
+        {
+            return eyeSystem.FindEyeTargetByName(targetName);
+        }
+
+        return null;
+    }
+
     [YarnCommand("UF_spriteIn")]
     public IEnumerator UF_spriteIn(float duration = 1.5f)
     {
-        if (eyeSystem.CurrentTarget != null)
+        var target = ResolveSpriteTarget();
+        if (target != null)
         {
             AudioManager.Instance.PlaySfx("event:/ActionFB/color_imagine");
-            eyeSystem.CurrentTarget.ImageIn(duration);
+            target.ImageIn(duration);
         }
 
         yield return new WaitForSeconds(duration);
@@ -77,10 +100,11 @@ public class UFSystem : MonoBehaviour
     [YarnCommand("UF_spriteOut")]
     public IEnumerator UF_spriteOut(float duration = 1.5f)
     {
-        if (eyeSystem.CurrentTarget != null)
+        var target = ResolveSpriteTarget();
+        if (target != null)
         {
             AudioManager.Instance.PlaySfx("event:/ActionFB/color_imagine");
-            eyeSystem.CurrentTarget.ImageOut(duration);
+            target.ImageOut(duration);
         }
 
         yield return new WaitForSeconds(duration);