By Gregory Pratt From Chicago Tribune CHICAGO—Leading up to the summer months when Chicago historically sees its highest levels of violence, Mayor Lori Lightfoot vowed to take an “all hands on deck” approach to stopping the city’s shootings. But even as the city canceled days off for Chicago cops and forced them to work 12 hour days, two of the mayor’s top aides took time off leading up to the Fourth of July holiday, where at least 108 people were shot, 17 fatally. Some aldermen criticized the absences. Lightfoot Chief of Staff Sybil Madison was out of the office on Thursday and Friday, Madison told city workers in an email. Madison, who became chief of staff just last month after serving as the mayor’s deputy for education and human services, said Lightfoot’s new chief operating officer, Paul Goodrich, would be in charge while she’s out. Goodrich joined the mayor’s office last …