With hopes dimming for their $2 billion dream stadium in Manhattan, the Jets are closing in on a 10-year extension to the team's lease at Giants Stadium, state officials said yesterday. The new lease would firm up the Jets' right to remain in Giants Stadium until 2018, providing the team with a serious backup plan if its proposed West Side stadium project falls through. It also gives the team major leverage in upcoming talks with the Giants, who need the Jets' approval to build a $750 million stadium in the Meadowlands next to the existing one. Carl Goldberg, chairman of...