A 32-year-old woman from Delhi presents with a 2-month history of generalized maculopapular rash involving the trunk, palms, and soles. She also reports fever, malaise, and painless generalized lymphadenopathy. On examination, she has a copper-coloured rash and mucous patches in the mouth. Serological testing shows positive RPR (titre 1:64) and positive TP-PA. She denies any genital ulcer currently. What is the most likely stage of syphilis?