Add next/core-web-vitals ESLint config, fix unescaped entities

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

Guest upgrade, DB migration, settings functional, full Phase 1 feature set

full dark migration: CSS overrides for all legacy classes, framer-motion animations across every page/component, rebrand to Bio Nexus

named exports, any->unknown, theme toggle (light/dark), dark mode fixes, error extractor, deleted pipline/ typo dir

Deploy prep: Render config + Dockerfile, refactored backend auth flow, dashboard, landing page, error states, guest flow