Wearing a smart black suit with pink pumps and a matching handbag, Lucia Sanchez had an eye for fashion yesterday - but not for her co-defendant boyfriend, Bronx state Sen. Efrain Gonzalez Jr. The indicted twosome pleaded not guilty yesterday to federal mail and wire-fraud charges, but didn't acknowledge each other during a brief appearance in Manhattan Federal Court. They arrived separately and sat a row apart as they waited their turn at the defense table. But federal prosecutors say the two worked closely together for more than seven years to loot a Bronx charity out of more than $400,000...