Stack validation probe

Smoke test for Angular 21 zoneless SSR on Cloudflare Workers, Tailwind v4, and Spartan brain primitives (Angular CDK overlay backing the dialog). Toggle the theme in the header to verify CSS custom properties switch server-side and client-side without FOUC. See /cached/:id for cache tests and /admin for data-driven invalidation.

theme state

user choicesystemresolvedlight

form primitives

Sample input

echo:

overlay (Angular CDK via Spartan brain dialog)

Tests that CDK overlay hydrates cleanly under zoneless SSR — Section 6 risk.