Urgent issues — like the city’s worsening housing crisis and the mounting threats from the Trump administration — have gotten far less attention than they deserve in the New York mayoral race. How to deal with the Trump administration’s aggression, like the masked federal agents and armored vehicle in Manhattan this week, is a new and unpredictable problem. But housing is a longstanding issue the city has faced. Addressing the crisis will require every big idea and drop of political capital the next mayor can muster.