细化一些UI

我觉得TimelineCanvas可以利用一下
比如把note放在上面？

Assets/Scripts/Manager/OperationManager.cs

@@ -19,7 +19,14 @@ namespace Ichni.Editor
         
         public void SelectElement(GameElement gameElement)
         {
+            if(currentSelectedElement != null)
+            {
+                currentSelectedElement.connectedTab.isSelected = false;
+                currentSelectedElement.connectedTab.BgImage.color = new Color(0.5f, 0.5f, 0.5f, 0);
+            }
             currentSelectedElement = gameElement;
+            currentSelectedElement.connectedTab.isSelected = true;
+            currentSelectedElement.connectedTab.BgImage.color = new Color(0.5f,0.5f, 0.5f, 0.2f);
         }
     }