[frontend] Monorepo scaffold: apps/web with Next.js 14 App Router (no src-dir) + Tailwind

[ozpool]

Context

Bootstrap the Next.js app. Everything frontend is blocked on this.

Ref: PRISM_PRD_v1.0.html §Day 1.

Scope

In scope:

• apps/web scaffold via pnpm create next-app@latest --typescript --tailwind --app --no-src-dir
• Tailwind + PostCSS configured
• TS strict mode

Out of scope:

• wagmi wiring ([frontend] Providers: wagmi v2 + viem v2 + RainbowKit v2 + TanStack Query on Base Sepolia #44)

Acceptance Criteria

• pnpm --filter web dev renders a placeholder page
• All tx states rendered (idle/pending/success/error/wrong-network)
• wagmi v2 + viem v2 (not ethers)
• ABIs from packages/shared (never hand-maintained)
• Keyboard navigable; semantic HTML; WCAG AA contrast
• Responsive at 320 / 768 / 1280
• pnpm typecheck && pnpm lint && pnpm test pass

Dependencies

• Blocks: [frontend] Providers: wagmi v2 + viem v2 + RainbowKit v2 + TanStack Query on Base Sepolia #44, [frontend] App shell: header + nav + dark-only theme provider + footer + error boundary #47, [frontend] Marketing landing page: hero + refraction narrative + features + CTA + footer #48
• Blocked by: [contracts] Monorepo + Foundry workspace: pnpm + Turborepo + foundry.toml (via_ir, cancun) #15

References

• PRD §Day 1

Estimate

S

[ozpool]

apps/web scaffold shipped in #149. Next 14.2.18 App Router, TS strict, Tailwind dark-only with empty theme extends seam for #1. Typecheck/lint/build all green; pnpm-lock.yaml updated.