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

feat(landing): trust & craft pass — sample result preview with confidence bands, honest service/status copy, unified CTA verbs, grouped database taxonomy, 44px nav touch targets, calmer motion (no chevron loop, glow under nav)

feat(theme): dual light/dark mode with Apple light theme, toggle, and theme-aware viewers

Add MSA pairwise refinement, new UI components (SmoothLoader, Reveal, CursorGlow, Parallax), rate-limit handling in AIInterpretation