The session cookie is named ct_session. It is httpOnly, SameSite=Lax, and marked Secure in production. It exists so the account pages know it is you. Logging out deletes it.
The dismiss control on the cookie banner stores a flag in localStorage, not a cookie. Page counts are sent to this site without a cookie, and they are skipped when the browser sends Do Not Track. Paths that contain a player ID are stored as /players/:id/.
Google Tag Manager (container GTM-P77TLJ9G) loads on every page, including signed-in pages. The container can set cookies based on the tags configured inside it. The dismiss button on the banner does not block that container.
Polar’s checkout loads in an iframe on this site when you pay. Their cookies are described in Polar’s own notice.