SANTA CLARA — The 49ers erased a 17-point halftime deficit, capitalizing on a slew of mistakes to beat the Lions 34-31 in the NFC Championship Game. With the 34-31 victory, the 49ers are heading to Las Vegas for Super Bowl LVIII. They’ll meet Patrick Mahomes and the Kansas City Chiefs at Allegiant Stadium for a rematch of Super Bowl LIV in 2020, which the Chiefs won, 31-20. It’s a meeting of the most transcendent player in the sport against the league’s best all-around team. Mahomes is armed with an elite defense, but the 49ers have All-Pro talent all over the gridiron. The Chiefs have reached…