Drop upload; organelle-first; equal-height panels; ODE-step slider replaces GIF; titles with colon

Tighter plots: constrained layout, fix cropped suptitle, less whitespace

Taller renders, theme-matched plot backgrounds; section 2 title + drop PCC table

Restructure UI: 3 sections (data/regression/generative), per-section T/Z, per-step PCC