New stadium isn’t giving the 49ers a true home-field advantage

The 49ers christened a new home stadium this year, but they’re still waiting for a new home-field advantage. Tim Kawakami of the San Jose Mercury News takes a look at the “relatively tranquil” atmosphere at Levi’s Stadium.  And Kawakami makes a great point — if a home-field advantage doesn’t emerge tonight against the Seahawks, it…