WASHINGTON — President-elect Joe Biden will deliver an appeal to national unity when he is sworn in Wednesday and plans immediate moves to combat the coronavirus pandemic and undo some of President Donald Trump’s most controversial policies, his incoming chief of staff said Sunday. Biden intends a series of executive actions in his first hours after his inauguration, an opening salvo in what is shaping up as a 10-day blitz of steps to reorient the country without waiting for Congress, aide Ron Klain said. Klain told CNN’s “State of the Union” that Biden, in his inaugural address to the nation, will deliver “a message of moving this country forward.