redesign: site-wide UI/UX overhaul per web-interface-guidelines
- unified design system: focus-visible rings, reduced-motion, color-scheme,
theme persistence, tightened emerald radius tokens (checkbox circle bug)
- redesigned all pages: Home/Login/Signup/404, dashboard shell, Overview hero
(time-based gradient), list pages with empty states, form modals, detail pages
- role-scoped navigation: console menu vs admin console with cross-switch
entries, Chinese route titles and breadcrumbs
- theme switcher (light/dark/auto) via composables/theme, home + dashboard
- state-driven dropdowns (touch-safe logout), menu divider pointer-events fix
- btn-primary unified to black-on-white / white-on-black per theme
- update REFACTOR_PLAN.md (increments 2-6)
Sakurasan
1e07c5903f