From superstar to the biggest pop star in the world: This is the journey that singer-songwriter Taylor Swift has been on over the past year and a half. The 34-year-old has reached such an unprecedented level of fame that every step she takes in public is certain to make the news. Like when she was spotted dancing with her boyfriend, Kansas City Chiefs footballer Travis Kelce, at the Cochella Valley Music and Arts Festival in California. Or when they went out for a sushi dinner last week. Time Magazine, in crowning Swift Person of the Year 2023, put it this way: “To discuss her movements felt l…