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/BaseLayers.tsx

@@ -179,7 +179,7 @@ const BaseLayers: React.FC = () => {
   };
 
   return (
-    <div className="absolute right-17 bottom-8 z-99">
+    <div className="absolute right-17 bottom-8 z-1300">
       <div
         className="w-20 h-20 bg-white rounded-xl drop-shadow-xl shadow-black"
         onMouseEnter={handleEnter}