New client/ directory, standalone from the backend: Vite 8 + React
19.2 + TypeScript 6. Tailwind v4 via @tailwindcss/vite plugin (no
postcss config needed). shadcn/ui compatibility wired via
components.json + lib/utils.ts. @tanstack/react-query + react-router-dom
installed for server state + routing.
Vite config essentials:
base: '/app/' — Express mounts SPA at /app/*, vanilla JS stays at /
outDir: '../public/app/' — build lands next to existing static assets
@/* → ./src/* (client-local imports)
@shared/* → ../shared/* (typed wire protocol shared with backend)
server.proxy '/api' → localhost:3000 for `npm run dev`
tsconfig.app.json — added baseUrl + paths + include ../shared so the
shared/types.ts + schemas.ts are typechecked on the client side too.
src/index.css — Tailwind v4 @import, shadcn HSL design tokens (light +
dark schemes). Replaces the vite starter template's decorative styles.
No backend touched. Express route serving /app/* lands in Day 7.
