First lady Jill Biden has a valentine for the American people: giant pink, white and red hearts bearing calls for “unity,” “hope” and “love” installed early Friday on the North Lawn of the White House. “I just wanted some joy,” the first lady told reporters during a surprise visit to the lawn with President Joe Biden and their two German shepherds, Champ and Major. “I think things have been so — with the pandemic — everybody’s feeling a little down, so it’s just a little joy, a little hope, that’s all.” The oversized hearts, also emblazoned with words like “kindness,”...