feat(export): add downloads to ADMET, MD, pairwise, AlphaFold, docking, pathway, plus 4 new learn topics

Refine design system: semantic color tokens, tiered motion, denser result cards, VinaLog toolbar

Polish tool pages: fix dead bg-glass-card classes, contrast on teal, confidence band tokens, RNA badge

Convert legacy light pages (auth, callback, shared, blast) and components to native dark tokens

refactor(icons): migrate lucide-react to @phosphor-icons/react, remove dep

Docking viewer upgrade: Molstar GPU rendering, proper interaction geometry, 3D dashed-line rendering

feat: add interaction fingerprinting and 3Dmol.js viewer to molecular docking page