migrate from vanilla TypeScript + Bun bundler to React 19, Vite, TanStack Router,
Zustand, shadcn-style components, Tailwind v4, vite-plugin-pwa.
game logic moves into a Zustand store, UI into React feature components with
file-based routing. all 27 tests pass, biome lint clean.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
