49ers score late to stave off Packers’ upset efforts, 24-21

History said the 49ers were in trouble when they entered the fourth quarter trailing.The 49ers were 0-30 under Kyle Shanahan when trailing by seven or more points after three quarters, losing by an average of 14.3 points. Quarterback Brock Purdy had led only one fourth quarter comeback in his career, a 37-34 overtime victory over the Raiders in Week 17 of the 2022 season.But Christian McCaffrey scored on a 6-yard run with 1:07 remaining, delivering a 24-21 win over the upset-minded Packers on a rainy night in Santa Clara. The 49ers will host the NFC Championship Game next Sunday.The Packers outplayed the 49ers for most of the night, but unlike last week when the Cowboys disappeared, San Francisco hung around. Packers rookie Anders Carlson, who made two field goals of 29 yards, missed a 41-yard field goal attempt with 6:18 remaining. The 49ers then drove 69 yards in 12 plays, burning 5:11 off the clock. Packers coach Matt LaFleur, who had three timeouts, inexplicably didn't call one after a Purdy scramble with 1:55 left, allowing another 40 seconds to run off the clock.So, the Packers had only 1:07 left to try to drive into field goal range to send the game in overtime.The Packers...