feat: Implement Phase 5 optimization and best practices

src/App.tsx

@@ -3,6 +3,7 @@ import { Toaster } from "@/components/ui/toaster";
 import { Toaster as Sonner } from "@/components/ui/sonner";
 import { TooltipProvider } from "@/components/ui/tooltip";
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import { ReactQueryDevtools } from '@tanstack/react-query-devtools';
 import { BrowserRouter, Routes, Route } from "react-router-dom";
 import { AuthProvider } from "@/hooks/useAuth";
 import { LocationAutoDetectProvider } from "@/components/providers/LocationAutoDetectProvider";
@@ -122,6 +123,12 @@ const App = () => (
     <AuthProvider>
       <AppContent />
     </AuthProvider>
+    {import.meta.env.DEV && (
+      <ReactQueryDevtools 
+        initialIsOpen={false}
+        position="bottom"
+      />
+    )}
   </QueryClientProvider>
 );