A 32-year-old woman presents with a 6-month history of recurrent headaches occurring 2–3 times per week. She describes a pressing, band-like sensation across both temples and the occipital region, lasting 30 minutes to 2 hours. The pain is mild to moderate in intensity and does not prevent her from working. She denies nausea, vomiting, photophobia, or phonophobia. Neurological examination is normal. She reports increased stress at work and poor sleep. What is the most likely diagnosis?