fix: ActivateExperimentObjects 用 FindObjectsOfType(includeInactive) 替代 GameObject.Find

medicalBox 初始 inactive，GameObject.Find 只能找活跃对象
改为 FindObjectsOfType<GameObject>(true) 遍历所有对象查找

Assets/Scripts/UI/PageController.cs

@@ -303,7 +303,8 @@ public class PageController : MonoBehaviour
             openingFlow.PlayOpeningFlow(() =>
             {
                 Debug.Log("PageController: 片头动画完成，显示 ExperimentPanel");
-                ActivateExperimentObjects();                ShowPage(Page.Experiment);
+                ActivateExperimentObjects();
+                ShowPage(Page.Experiment);
 
                 var stepManager = FindObjectOfType<StepManager>();
                 if (stepManager != null)
@@ -337,8 +338,19 @@ public class PageController : MonoBehaviour
     private void ActivateExperimentObjects()
     {
         Debug.Log("PageController: [ActivateExperimentObjects] 显示实验物件");
-        var medicalBox = GameObject.Find("medicalBox");
-        if (medicalBox != null) medicalBox.SetActive(true);
+
+        // 用 includeInactive 搜索，避免 medicalBox inactive 时 Find 返回 null
+        var allObjects = FindObjectsOfType<GameObject>(true);
+        foreach (var go in allObjects)
+        {
+            if (go.name == "medicalBox")
+            {
+                go.SetActive(true);
+                Debug.Log("PageController: medicalBox 已显示");
+                return;
+            }
+        }
+        Debug.LogWarning("PageController: 未找到 medicalBox");
     }