Verification emails linked to /verify-email?token=..., but no such route existed in main.tsx and nothing in the frontend ever called POST /api/customers/verify-email. The SPA catch-all served index.html, no route matched, and the page rendered blank -- so the token was never redeemed and accounts stayed unverified forever. The gap was invisible until SMTP was configured, because no verification email had ever actually been delivered. Adds VerifyEmail.tsx (verifying / verified / failed states), a verifyEmail call in customerApi, and the route. The request is pinned to a single firing via a ref: the endpoint deletes the token on success, so StrictMode's double effect invocation in dev would otherwise overwrite the success state with "invalid or expired token". Verified end to end against a local stack: a real token flips customers.email_verified to true and is consumed from customer_tokens. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>