Angela Lansbury in 1973. Photo: Evening Standard/Hulton Archive/Getty Images Every generation alive today has had its own Angela Lansbury. The TikTok generation found her most recently, toasting her for her longevity and thrilled by her ability to deliver a killer number with Bea Arthur at the Oscars. Millennials grew up to the sound of her voice guiding them through Beauty and the Beast; Generation X (watching TV with their folks) treasured her as the cozy, competent star of Murder, She Wrote; boomers adored her for her theater career, particularly her glitzy Broadway Mame; and their parents loved her for Golden...