Mia Weinberger’s mom asked her the one question she had spent years preparing for: “I don’t know that much about Taylor Swift, can you educate me?” The 35-year-old filmmaker created a PowerPoint presentation that covered every era, important exes, Swiftie customs, Eras Tour fan traditions, Swift numerology and Easter eggs. “The presentation was called Barb’s version,” Weinberger says over Zoom. …