Which cookies this app sets, and why none of them need your consent.
Signing in sets a session cookie (a signed token that identifies your account for seven days, or until you sign out) and a CSRF cookie that protects the sign-in form from forged requests. Both are HttpOnly, sent only over HTTPS in production, and limited to this site. Without them you cannot stay signed in, so they are exempt from consent.
Your theme choice (light or dark) and the fact that you dismissed the cookie notice are kept in this browser's local storage. They never leave your device and identify nothing.
No advertising, tracking or social-media cookies are set. If page-view analytics are enabled they are cookieless. Stripe sets its own cookies on checkout.stripe.com, under Stripe's policy, when you are redirected there to pay.