add: new tests

add: ShadcnUI and fix mobile layout

chore(deps): Tailwind v3->v4 and bug fixes

add: table render for tables

LCP optimization

perf: improve FCP, LCP (vercel)

perf: RCS vercel improve

del checklist and add more admin controls

perf: SWR and optimization

img upload and overflow fix

mobile optimized UI

test: add Playwright E2E suite, CI action, and UI performance optimization

refactor/perf: light/dark mode + add tests + optimize

chore: color contrast, math render

🎨 Palette: Add tooltips and ARIA labels to Navbar buttons

⚡ Bolt: Add React.memo to MathText to prevent unnecessary KaTeX parsing and re-renders

fix: math render and light mode

fix: math fn render

initial commit