重新设计弹出组件的层次布局，非常驻窗口将置于顶部；新增变量控制水流图层的显示；完善历史数据面板的设计

src/app/OlMap/Controls/DrawPanel.tsx

@@ -306,7 +306,7 @@ const DrawPanel: React.FC = () => {
   const isSaveDisabled = drawnFeatures.length === 0;
 
   return (
-    <div className="absolute top-20 left-4 bg-white p-1 rounded-xl shadow-lg flex flex-col opacity-85 hover:opacity-100 transition-opacity z-10">
+    <div className="absolute top-20 left-4 bg-white p-1 rounded-xl shadow-lg flex flex-col opacity-85 hover:opacity-100 transition-opacity z-1300">
       <div className="flex">
         <ToolbarButton
           icon={<BackHandOutlinedIcon />}