Lewis Hamilton brings leadership qualities that are “crucial” to Mercedes’ hopes of fighting for future Formula 1 championships, according to team principal Toto Wolff, after confirming the team’s driver lineup through 2025. Mercedes announced new contract extensions for Hamilton and teammate George Russell on Thursday ahead of the Italian Grand Prix, with both drivers committed to the team for the next two seasons. Hamilton’s deal had been due to expire at the end of this year, but Wolff says he was always going to re-sign due to the central role he plays and the success the partnership has had in…