The repo's first frontend test setup: Vitest, React Testing Library, jsdom.
Scoped to the flows that lose money or leak data when broken, per spec 4.
lib/api.ts collapses every failure into three the UI can act on:
NotConnected (unreachable, or no URL baked in), ApiError 401 (redirect), and
ApiError with the backend's own message, which is customer-facing and shown
verbatim rather than replaced with something vaguer.
The not-connected panel names the variable, the value baked in, and both
reasons it fails -- unreachable from the browser, or missing from admin's
ADMIN_ORIGIN. Proven by test before it existed.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
