Fashion powerhouse Chanel stacked the Paris front row like a movie premiere Tuesday, with stars from Nicole Kidman to Dua Lipa to Penélope Cruz, then handed the spotlight to its new designer, Matthieu Blazy, for his much-anticipated couture debut. Inside the Grand Palais, the set was a dream-garden of candy-colored trees and giant pink-and-red mushrooms — a surreal antidote to the gray Paris day outside, and to the heavier mood of the world beyond the doors. Then came the clothes, and the message landed fast: lightness.