Charlee Roundhill has designs on a designer purse.  It’s a haute must-have the soon-to-be 30-year-old feels she deserves — in celebration of her milestone birthday on Wednesday.  But the couture carryall that’s caught her eye isn’t one in the bunch of highly coveted bags from Matthieu Blazy’s new Chanel spring/summer 2026 collection — finery that recently sent NYC’s most elite  pouring into the streets  for first grabs at the goods.  Charlee Roundhill shows off a 1996 Celine Macadam Dome bag that is a perfect “birthday bag” for those born in that year.…