Split Compare Slider

Two identically framed images are stacked; the top one is cropped with clip-path and a 3px white divider (with a round knob) is driven by the same progress value as the crop — the "before" fills the frame for 0.6s → slides to the centre in 1.4s → holds 1.5s → nudges to 42% and back → slides to 8% to almost fully reveal the "after" → returns to centre, holds 1s → exits with both images; both images share one 1→1.04 ultra-slow push