Revert ping undo logic to reset the entire ping sequence back to 004

Assets/Scripts/Core/UndoManager.cs

@@ -32,10 +32,10 @@ public static class ActionHistory
         var item = History.Pop();
         Debug.Log($"[ActionHistory] Undo {item.Type} handler={(item.Handler != null ? item.Handler.name : "null")}, remaining={History.Count}");
         
-        if (item.Type == ActionType.PingSecond)
+        if (item.Type == ActionType.PingFirst || item.Type == ActionType.PingSecond)
         {
-            // 如果在包扎(第二阶段)，则重置所有的包扎纱布，退回到所有骨折点发光的状态
-            while (History.Count > 0 && History.Peek().Type == ActionType.PingSecond)
+            // 如果遇到任何 Ping 的动作，就代表用户想重置整个包扎步骤
+            while (History.Count > 0 && (History.Peek().Type == ActionType.PingFirst || History.Peek().Type == ActionType.PingSecond))
             {
                 History.Pop();
             }
@@ -44,12 +44,20 @@ public static class ActionHistory
             foreach (var p in allPings)
             {
                 if (p.chanraoObject != null) p.chanraoObject.SetActive(false);
-                p.gameObject.SetActive(true);
-                p.ReEnableBorder();
+                
+                if (p.pingIndex == 0)
+                {
+                    p.gameObject.SetActive(true);
+                    p.ResetState();
+                }
+                else
+                {
+                    p.UndoShow();
+                }
             }
 
             var sm = Object.FindObjectOfType<StepManager>();
-            if (sm != null) sm.SetPingStepIndex(8); // 退回到 4 个底模已确认的状态 (Ping 阶段的第一半结束)
+            if (sm != null) sm.SetPingStepIndex(0);
             
             return true;
         }