feat(design): bioluminescent green+violet palette and re-tuned landing hero

chore: frontend design polish (accent palette, remove glow/gradient utils), ignore installed skill trees, add opencode skills config

fix: forward backend error detail in 4 components

fix: handle non-200 responses in domains, interactions, ramachandran, SS components

feat: domains, interactions, primers, structure analysis, wizard, phylo tree, conservation