(Warning: This post contains spoilers for Sunday’s finale of “American Idol.”)“American Idol” crowned its Season 19 winner on Sunday in a three-hour live finale featuring performances from the Top 3, the season’s eliminated contestants and judges Luke Bryan, Katy Perry and Lionel Richie.The episode aired live coast-to-coast, with voting open for the entire run of the show as the audience chose between finalists Chayce Beckham, Grace Kinstler and Willie Spence.At the end of the night, Beckham was