Pope Leo XIV presented his first encyclical since being elected the leader of the Catholic Church a year ago, Magnifica Humanitas (Magnificent Humanity) On Safeguarding the Human Person in the Time of Artificial Intelligence, in the Vatican on Monday.     Over five chapters and more than 200 pages, the letter stresses that justice and fraternity are possible and that technology should advance without causing the human heart to regress.     "Humanity, created by God in all its grandeur, is today