## FRONTEND: Create 404 and Global Error Pages

[OSEH-svg]

Description
Navigating to a nonexistent route shows Next.js's default error page, which does not match the Agora design.

Tasks

• Create apps/web/app/not-found.tsx with a custom 404 layout (illustration, message, link back to home).
• Create apps/web/app/error.tsx (Next.js App Router error page) for runtime errors.
• Both pages should match the Neubrutalist design system.
  Acceptance Criteria
• Visiting /nonexistent-route renders the custom 404 page.
• Runtime errors caught by Next.js render the custom error page.