Last year Madi Magid, an 11-year-old from Dallas, celebrated her birthday in style: with a Taylor Swift–inspired mah-jongg party. There was a custom friendship bracelet–style sign that spelled out “In My MadiJong Era,” tile beads for bracelet-making, and even claw clips with craks, bams, and dragons. The main event? A 90-minute mah-jongg lesson.“I love Taylor Swift and I love mah-jongg, so I put them together,” said Magid, who added that it was …