POST /api/v2/user/token/refresh reads the HttpOnly refresh cookie, rotates
the session, mints a new JWT, and sets the new cookie — reusing the shared
auth.RefreshSession core (no v1 change) and the #2912 cookie helpers /
authTokenBody response shape. The cookie is set via the unwrapped echo ctx,
not the OpenAPI spec.
translateDomainError now maps *echo.HTTPError (which RefreshSession returns
for missing/invalid/expired/replayed tokens) so those land as the right
status instead of a 500. Completes the v1→v2 REST migration.
kolaente