Apply security fixes

Implement security enhancements as suggested by the security review.

src/App.tsx

@@ -2,6 +2,7 @@ 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 ErrorBoundary from "@/components/ErrorBoundary";
 import { BrowserRouter, Routes, Route } from "react-router-dom";
 import Index from "./pages/Index";
 import InteractiveIndex from "./components/InteractiveIndex";
@@ -37,11 +38,12 @@ import NotFound from "./pages/NotFound";
 const queryClient = new QueryClient();
 
 const App = () => (
-  <QueryClientProvider client={queryClient}>
-    <TooltipProvider>
-      <Toaster />
-      <Sonner />
-      <BrowserRouter>
+  <ErrorBoundary>
+    <QueryClientProvider client={queryClient}>
+      <TooltipProvider>
+        <Toaster />
+        <Sonner />
+        <BrowserRouter>
         <Routes>
           <Route path="/" element={<Index />} />
           <Route path="/index" element={<InteractiveIndex />} />
@@ -80,9 +82,10 @@ const App = () => (
           {/* ADD ALL CUSTOM ROUTES ABOVE THE CATCH-ALL "*" ROUTE */}
           <Route path="*" element={<NotFound />} />
         </Routes>
-      </BrowserRouter>
-    </TooltipProvider>
-  </QueryClientProvider>
+        </BrowserRouter>
+      </TooltipProvider>
+    </QueryClientProvider>
+  </ErrorBoundary>
 );
 
 export default App;