Last week, Mayor Zohran Mamdani made two appearances designed to showcase a hands-on leader tackling the city’s housing crisis. Instead, they revealed a mayor focused on optics — while missing the priorities that matter. In one social-media video, the mayor shadowed Housing Preservation and Development inspectors at a privately owned apartment building. Here comes the mayor, on the ground — cameras in tow — to hold landlords accountable. “There’s a lot of New Yorkers who live with a worry about whether or not the conditions they’re living in are actually up to code,” Mamdani declared. “It’s the city’s job to deliver them.” Behind the mayor, however, viewers saw a clean apartment in a well-kept building, whose landlord was being nitpicked to death in a city suffering the worst housing shortage in its modern history.…