update card icon ui (#50)

* feat: update icons in various components and improve styling for better UI consistency

frontend/src/pages/OperatorMarket/Home/components/Filters.tsx

@@ -140,7 +140,7 @@ const Filters: React.FC<FiltersProps> = ({
               className="cursor-pointer hover:text-blue-500"
             ></Button>
           </Tooltip>
-          <h4>筛选器</h4>
+          <span>筛选器</span>
         </h3>
         {hasActiveFilters && (
           <span

frontend/src/pages/OperatorMarket/operator.const.tsx

@@ -1,9 +1,9 @@
-import { Boxes } from "lucide-react";
+import { Code } from "lucide-react";
 import { OperatorI } from "./operator.model";
 
 export const mapOperator = (op: OperatorI) => {
   return {
     ...op,
-    icon: <Boxes className="w-5 h-5 text-gray-500" />,
+    icon: <Code className="w-full h-full" />,
   };
 };