Phase 0: scaffold cup26 — Vite+React+Fastify TS PWA, broadcast theme, app shell

Mirrors the TTRPG stack (strict TS, Tailwind 4, vite-plugin-pwa, esbuild server
bundle, multi-stage Dockerfile, Traefik compose). Floodlit-pitch design tokens,
UI primitives (Button/Card/Badge), TanStack Router shell with Live/Groups/
Bracket/Predict/Story routes (placeholders), dependency-free PWA icon generator.
Raw data staged: openfootball 2026 fixtures + martj42 international results CSV.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

vitest.setup.ts

@@ -0,0 +1,7 @@
+import '@testing-library/jest-dom/vitest';
+import { cleanup } from '@testing-library/react';
+import { afterEach } from 'vitest';
+
+afterEach(() => {
+  cleanup();
+});