Add multiselect.

frontend/app/routes/$.tsx

@@ -0,0 +1,25 @@
+import { redirect } from 'react-router'
+import type { Route } from './+types/$'
+
+export async function loader({ request }: Route.LoaderArgs) {
+  const url = new URL(request.url)
+
+  // Handle React DevTools and other development files
+  if (
+    url.pathname.endsWith('.js.map') ||
+    url.pathname.includes('installHook') ||
+    url.pathname.startsWith('/__') ||
+    url.pathname.startsWith('/node_modules/')
+  ) {
+    // Return a 404 response for these dev-only requests
+    throw new Response('Not Found', { status: 404 })
+  }
+
+  // For any other unmatched routes, redirect to home
+  return redirect('/')
+}
+
+export default function CatchAll() {
+  // This component should never render since we always redirect or throw
+  return null
+}