OMAHA, NEBRASKA — Taylor Nielsen rests in a room with a view. The wall-to-wall windows feature midtown on an overcast afternoon in late March. The natural light makes the hospital room more tolerable but exposes just how yellow Taylor’s skin is. He drifts in and out of sleep. His dad, David Nielsen, hovers over his only child, places his right hand on Taylor’s swollen belly. Fluid has bloated Taylor, pooling around his barely functioning liver…