feat: enhance CSV import functionality, integrate react-query for data fetching, and refactor admin components

frontend/src/main.tsx

@@ -1,10 +1,14 @@
-import { StrictMode } from 'react'
-import { createRoot } from 'react-dom/client'
-import './index.css'
-import App from './App.tsx'
+import { StrictMode } from "react";
+import { createRoot } from "react-dom/client";
+import "./index.css";
+import App from "./App.tsx";
+import { QueryClientProvider } from "@tanstack/react-query";
+import { queryClient } from "./queryClient";
 
-createRoot(document.getElementById('root')!).render(
+createRoot(document.getElementById("root")!).render(
   <StrictMode>
-    <App />
-  </StrictMode>,
-)
+    <QueryClientProvider client={queryClient}>
+      <App />
+    </QueryClientProvider>
+  </StrictMode>
+);