/admin/popupnotification is a preview gallery, available only to super admins, of the system popups Sprwt shows to admin users: "Preview all popup notifications shown to admins. Click a card to see what each popup looks like." Each card names the popup, explains when it appears, shows tags for how often it repeats (Daily / Every 3 days), whether it expires (90d expiry / Never expires) and whether it can be snoozed, and has a Preview button that opens the modal. It is a reference tool — you cannot edit or disable the popups from this page.