Refactor sign-out functionality in Header component to use async/await for improved navigation handling, ensuring a smoother user experience during logout.

src/components/Header.tsx

@@ -30,7 +30,10 @@ export function Header() {
               <span className="text-zinc-400 dark:text-zinc-500">{session?.user?.email}</span>
               <button
                 type="button"
-                onClick={() => signOut({ callbackUrl: "/auth/login" })}
+                onClick={async () => {
+                  await signOut({ redirect: false });
+                  window.location.href = "/auth/login";
+                }}
                 className="text-zinc-500 hover:text-red-500 dark:text-zinc-400 dark:hover:text-red-400 transition-colors"
               >
                 déconnexion