Editor's note: The idea of putting workplaces and housing close to train, subway and light-rail lines is nothing new. But throughout the Bay Area, transit-oriented developments have been slow to come online. Now the region's twin crises — crippling traffic and inadequate housing — are fueling renewed momentum for mixed-use projects near transit. In a special report from the Silicon Valley Business Journal and San Francisco Business Times, we look at how transit-oriented development transformed…