A 28-year-old nulliparous woman attends the family planning clinic seeking long-acting reversible contraception. She has a regular 28-day menstrual cycle with moderate menorrhagia (60 mL blood loss per cycle) and dysmenorrhea managed with NSAIDs. She has no history of pelvic inflammatory disease, ectopic pregnancy, or sexually transmitted infections. On examination, her uterus is anteverted, normal size, and mobile. She declines hormonal contraception due to concerns about systemic side effects. Which IUCD is the most appropriate choice for this patient?