fix: deselectAll 补上 selectedOverlay 清理

js/script.js

@@ -2386,6 +2386,10 @@
             selectedInput = null;
             hidePositionInfo();
         }
+        if (selectedOverlay) {
+            selectedOverlay.classList.remove('selected');
+            selectedOverlay = null;
+        }
         // 隐藏编辑器工具栏
         editorToolbar.classList.remove('active');
     }