Improve mobile support

frontend/src/core/hooks/useDownloadAppScreen.tsx

@@ -0,0 +1,13 @@
+import { Navigate } from "react-router-dom";
+import { MINIMUM_WIDTH } from "../config";
+import useWindowSize from "./useWindowSize";
+
+export default function useDownloadAppScreen() {
+    const { width } = useWindowSize();
+    const isMobile = width < MINIMUM_WIDTH;
+
+    return {
+        isMobile,
+        navigate: isMobile ? <Navigate to="/download-app" replace /> : null
+    };
+}