Why would they need to back to Canva? If teams are working within claude already I think they will just offboard canva/figma tasks into claude.

Non designers will vibe-design a prototype with claude, export it to canva and let the designers finish it up

If code doesn't go this direction soon, I'd be surprised. PM builds a prototype with claude, or designer designs something in figma/canva - claude vibe codes 70% of the solution using your company's frameworks and design system, then hands it off to the developer who finishes it and productionizes it