Today an anonymous visitor on /s/:token sees the board and nothing that says where it came from. Three ways to add the markx logotype and an invite to make their own. Same tokens as the app: Geist, ink oklch(0.244 0 0), the dark gradient default button, the title chip's white/85 + blur surface.
A sibling of the title chip in the slot logged-in viewers get "Duplicate to my workspace". Logotype, divider, dark "Make your own" button. On mobile it shrinks to the mark + "Make yours" at 44px, and the title chip truncates so they never touch.
A floating badge centred at the bottom, the Framer/Typedream pattern. Sits above the safe area. On mobile "Made with" drops so it fits at 48px tall.
A small card that slides in bottom-right after a few seconds of browsing (about 4s or the first pan), with a clear Dismiss and "Not now". Dismissal is remembered for the session. Full width on mobile.