MIAMI — Former President Donald Trump improperly shared a Pentagon “plan of attack” and a classified map related to a military operation, according to a sweeping 37-count felony indictment related to the mishandling of classified documents that was unsealed Friday and that could instantly reshape the 2024 presidential race.The indictment paints an unmistakably damning portrait of Trump’s treatment of sensitive information, accusing him of willfully defying Justice Department demands to return …