By Lacey Rose Writer-At-Large Sandra Stern’s office doesn’t look like it’s occupied by someone who’s a few weeks out from retirement. There are scripts piling on her desk and a series of framed photos and awards that she’s collected during her 40-plus year run in the entertainment business, more than half of them at Lionsgate, where she’ll finish as vice chairman of the television group. As Stern notes, she’ll stay on as a consultant for another year, though March 31 is her last day in a leadership role and her extensive travel plans commence immediately. “You know, I was terrified,” she says of closing this chapter. “There was an opportunity to take a buyout about a year and a half, two years ago, and a number of people who were close to retirement age took advantage of the opportunity, but I wasn’t ready.” That changed this past summer, when she told her boss, Lionsgate CEO Jon Feltheimer, that she’d be signing off at the end of her contract.…