If you could get on the list, it was the place to be. Judging from the line snaking down Robertson Blvd. into the wee hours on Saturday night, many did — but not everyone made it inside to catch a close-up glimpse of Madonna , who strolled behind the decks at 12:53 a.m., sending the packed crowd into a frenzy. The pop icon, 67, previewed two new songs at the (not-so) surprise appearance at Club Confessions — a one-night party at the legendary Abbey nightclub in West Hollywood. Doubling as a birthday bash for Tristan Schukraft, the CEO of telehealth company MISTR and owner of the storied gay Mecca, the event gave fans some of the earliest tastes of her next era. Wearing a powder-pink bustier — reminiscent of the archival piece she wore at Coachella that was later stolen — she rolled out two previously unheard cuts: “Love Sensation” and a track titled “Freedom” that played like a demo and quickly became the night’s centerpiece.…