San Jose Mayor Sam Liccardo and California economist Christopher Thornberg began the San Jose State Economic Summit battling to paint a rosier picture of the state’s economic future. “San Jose’s on fire,” Thornberg, founding partner of Los Angeles-based Beacon Economics LLC, said in his opening remarks Thursday. “Our job growth is fantastic,” retorted the mayor, who just finished his fifth month in August. Get the business scoops you need to start the day with our free Morning Edition…