Olivia Rodrgo performs at Acrisure Arena in Palm Springs, Calif., on Feb. 24, 2024. On her third album, “You Seem Pretty Sad for a Girl So in Love,” the 23-year-old singer delivers a polished, solemn breakup chronicle that misses her signature adrenaline rush. (OK McCausland/The New York Times) By LINDSAY ZOLADZ In the opening verse of “Drop Dead,” the heart-fluttering synth-pop single that kicks off Olivia Rodrigo’s third album, “You Seem Pretty Sad for a Girl So in Love,” the…