feat(peipei): 错色 Error overlay 淡入淡出驱动

自动绑定 sibling Error Sprite，并在 WrongColor 状态切换时同步 overlay alpha。

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

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

@@ -1,3 +1,4 @@
+using System;
 using AibisDream;
 using AibisDream.Kit;
 using AibisDream.Utility;
@@ -6,17 +7,23 @@ using UnityEngine;
 
 public class EyeTarget : MonoBehaviour
 {
+    private static readonly int AlphaId = Shader.PropertyToID("_Alpha");
+
     public Transform targetTransform;
 
     [Header("Optional overlay sprite for UF imagination")]
     [SerializeField] private SpriteRenderer imageSpriteRender;
 
+    [Header("Wrong-color overlay (e.g. plantError); auto-resolved from sibling if unset")]
+    [SerializeField] private SpriteRenderer wrongColorSpriteRenderer;
+
     [SerializeField] private Shader unifiedSpriteShader;
     [SerializeField] private EyeTargetVisual unifiedVisual;
 
     public Color _color;
 
     private EyeVisualSettings visualSettings = new();
+    private Material wrongColorMaterial;
 
     private void Awake()
     {
@@ -27,6 +34,7 @@ public class EyeTarget : MonoBehaviour
             return;
         }
 
+        EnsureWrongColorOverlay();
         EnsureUnifiedVisual(spriteRenderer);
         DisableLegacyChildRenderers();
         DisableLegacySiblingRenderers();
@@ -53,6 +61,7 @@ public class EyeTarget : MonoBehaviour
     public void KillVisualTweens()
     {
         unifiedVisual?.KillActiveTweens();
+        wrongColorMaterial?.DOKill();
     }
 
     private void EnsureVisualReady()
@@ -115,11 +124,13 @@ public class EyeTarget : MonoBehaviour
     public void SetToNoWrongColor()
     {
         unifiedVisual?.SetWrongColor(0f);
+        SetWrongColorOverlayAlpha(0f);
     }
 
     public void SetToWrongColor()
     {
         unifiedVisual?.SetWrongColor(1f);
+        SetWrongColorOverlayAlpha(1f);
     }
 
     public void FadeOut(float duration)
@@ -139,11 +150,13 @@ public class EyeTarget : MonoBehaviour
     public void WrongColorIn(float duration)
     {
         unifiedVisual?.TweenWrongColor(1f, duration)?.SetEase(Ease.InOutSine);
+        TweenWrongColorOverlay(1f, duration);
     }
 
     public void WrongColorOut(float duration)
     {
         unifiedVisual?.TweenWrongColor(0f, duration)?.SetEase(Ease.InOutSine);
+        TweenWrongColorOverlay(0f, duration);
     }
 
     public void BlurIn(float duration)
@@ -291,6 +304,90 @@ public class EyeTarget : MonoBehaviour
     /// <summary>
     /// 禁用同组下旧版 overlay（如 posterNoColor / computernocolor），避免盖住 unified 效果。
     /// </summary>
+    private void EnsureWrongColorOverlay()
+    {
+        if (wrongColorSpriteRenderer == null && transform.parent != null)
+        {
+            string errorName = $"{gameObject.name}Error";
+            foreach (var renderer in transform.parent.GetComponentsInChildren<SpriteRenderer>(true))
+            {
+                if (string.Equals(renderer.gameObject.name, errorName, StringComparison.OrdinalIgnoreCase))
+                {
+                    wrongColorSpriteRenderer = renderer;
+                    break;
+                }
+            }
+        }
+
+        if (wrongColorSpriteRenderer == null)
+        {
+            return;
+        }
+
+        wrongColorMaterial = Application.isPlaying
+            ? wrongColorSpriteRenderer.material
+            : wrongColorSpriteRenderer.sharedMaterial;
+        wrongColorSpriteRenderer.enabled = true;
+        SetWrongColorOverlayAlpha(0f);
+    }
+
+    private void SetWrongColorOverlayAlpha(float alpha)
+    {
+        if (wrongColorSpriteRenderer == null)
+        {
+            return;
+        }
+
+        alpha = Mathf.Clamp01(alpha);
+        if (alpha > 0f)
+        {
+            wrongColorSpriteRenderer.gameObject.SetActive(true);
+            wrongColorSpriteRenderer.enabled = true;
+        }
+
+        if (wrongColorMaterial != null && wrongColorMaterial.HasProperty(AlphaId))
+        {
+            wrongColorMaterial.SetFloat(AlphaId, alpha);
+        }
+
+        if (alpha <= 0f)
+        {
+            wrongColorSpriteRenderer.gameObject.SetActive(false);
+        }
+    }
+
+    private void TweenWrongColorOverlay(float alpha, float duration)
+    {
+        if (wrongColorSpriteRenderer == null || wrongColorMaterial == null || !wrongColorMaterial.HasProperty(AlphaId))
+        {
+            return;
+        }
+
+        if (alpha > 0f)
+        {
+            wrongColorSpriteRenderer.gameObject.SetActive(true);
+            wrongColorSpriteRenderer.enabled = true;
+        }
+
+        wrongColorMaterial.DOKill();
+        wrongColorMaterial
+            .DOFloat(alpha, AlphaId, duration)
+            .SetEase(Ease.InOutSine)
+            .OnComplete(() =>
+            {
+                if (alpha <= 0f && wrongColorSpriteRenderer != null)
+                {
+                    wrongColorSpriteRenderer.gameObject.SetActive(false);
+                }
+            });
+    }
+
+    private static bool IsWrongColorOverlayRenderer(SpriteRenderer renderer)
+    {
+        return renderer != null
+               && renderer.gameObject.name.EndsWith("Error", StringComparison.OrdinalIgnoreCase);
+    }
+
     private void DisableLegacySiblingRenderers()
     {
         Transform groupRoot = transform.parent;
@@ -316,6 +413,11 @@ public class EyeTarget : MonoBehaviour
                 continue;
             }
 
+            if (IsWrongColorOverlayRenderer(renderer))
+            {
+                continue;
+            }
+
             renderer.enabled = false;
         }
     }