Renders the consent page and the authorization error page. The default, Sake.Auth.Consent.Default, ships its own small style sheet. A host replaces it with consent: MyAppWeb.MCPConsent in the auth config.

render/1 receives: flow (:authorization_code, or :device for the device verification page), client_name, client_host (nil when unknown), redirect_host and loopback? (both nil for :device, where nothing is redirected), user_code (for :device, the code the person entered, to compare with the one on their device; nil otherwise), subject_display, scopes ([{name, description}]), resource (the endpoint URL the token will be for), request (opaque, goes into a hidden field), action (the POST path), csrf_token (empty when the host runs no CSRF middleware), issuer_name. Post the form's decision as approve or deny.

render_error/1 receives title, message, status; the device verification page also shows its final message with it, with status 200.

The optional render_user_code/1 is the device verification page's code entry form (Sake.Auth.Consent.Default's when a module does not define it). It receives user_code (the code to prefill, from verification_uri_complete, or ""), error (why the last code was refused, or nil), subject_display, request (opaque, goes into a hidden field), action, csrf_token and issuer_name; the form posts user_code.

A Sake.Auth.Consent struct is also a remembered approval of a client by a subject for one resource, held by Sake.Auth.Store.