Add explicit /404 route to render NotFound component

cgen-771a7599468d4636b06a82bf0fcb0ba0

client/App.tsx

@@ -98,6 +98,8 @@ const App = () => (
               <Route path="/privacy" element={<Privacy />} />
               <Route path="/terms" element={<Terms />} />
 
+              {/* Explicit 404 route for static hosting fallbacks */}
+              <Route path="/404" element={<NotFound />} />
               {/* ADD ALL CUSTOM ROUTES ABOVE THE CATCH-ALL "*" ROUTE */}
               <Route path="*" element={<NotFound />} />
             </Routes>