question: What could be the possible diagnosis for a young adult female who presents with symptoms of symmetric, migratory, polyarticular arthritis/arthralgias (inflammation/pain in multiple joints), brief morning stiffness, painless oral ulcers, splenomegaly (enlarged spleen), and laboratory findings of pancytopenia (low counts of all blood cells), RBCs (red blood cells), and proteinuria (protein in urine)?