With fireworks crackling overhead and a forest of spires lit in waves of colour, Pope Leo XIV on Sunday blessed a towering new addition to Barcelona's Sagrada Familia after celebrating mass inside the unfinished landmark, now the tallest church in the world. A fireworks and light display washed across the temple's exterior at the close of the ceremony, drenching the basilica in shifting hues and drawing the eye to its newly dominant silhouette. A 600-voice choir sang during the service, which lasted about 90 minutes and drew…