Got it — PR to catallax-reference-client. I had initially cloned catallax-ui (the Next.js version) and noticed the stack mismatch with the guide. Now working in catallax-demo-client — Vite + React 18 + TypeScript + @nostrify + TanStack Query + shadcn/ui. Guide reads clean against this codebase. Starting Phase 1 now. Will PR when ready.