new temporal folder to test

frontend-web-free/src/hooks/use-mobile.jsx

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+import * as React from "react"
+
+const MOBILE_BREAKPOINT = 768
+
+export function useIsMobile() {
+  const [isMobile, setIsMobile] = React.useState(undefined)
+
+  React.useEffect(() => {
+    const mql = window.matchMedia(`(max-width: ${MOBILE_BREAKPOINT - 1}px)`)
+    const onChange = () => {
+      setIsMobile(window.innerWidth < MOBILE_BREAKPOINT)
+    }
+    mql.addEventListener("change", onChange)
+    setIsMobile(window.innerWidth < MOBILE_BREAKPOINT)
+    return () => mql.removeEventListener("change", onChange);
+  }, [])
+
+  return !!isMobile
+}

frontend-web-free/src/hooks/useAuth.js

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+import { useState, useEffect } from 'react';
+import { onAuthStateChanged } from 'firebase/auth';
+import { auth } from '@/firebase';
+
+export function useAuth() {
+  const [user, setUser] = useState(null);
+  const [loading, setLoading] = useState(true);
+
+  useEffect(() => {
+    const unsubscribe = onAuthStateChanged(auth, (user) => {
+      setUser(user);
+      setLoading(false);
+    });
+
+    return () => unsubscribe();
+  }, []);
+
+  return { user, loading };
+}