SameSite=None Secure requirement for cross‑site auth cookies in Safari ITP
The goal is to maintain a cross‑site authentication flow that relies on a session cookie set on a third‑party domain (e.g., api.auth‑provider.com) while the user interacts with the main application (app.example.com). The cookie is set with SameSite=None to allow cross‑origin requests, and the server returns it over HTTPS. In local development the request ori