Seller Exp - Improve CTAs/messaging for users on first arriving at editor after onboarding

Feedback from Jacopo during "Back to Basics" testing of Seller Experience onboarding (paYJgx-1Wj-p2):

> I arrived [on the site editor] with the Sell intent, yet nothing here hints at that. The “Payment blocks” step in the welcome guide tour is the 9th out of 10. I doubt I would have seen that if I didn’t know already where to look.

How can we further refine the experience of the user arriving at the site editor from the sell flow, to make it more tailored to their specific needs?

Start by tracing the Sell-intent handoff into the site editor and reviewing the existing welcome guide tour, especially the “Payment blocks” step. Identify the current first-arrival CTAs and messaging, then confirm with the issue’s onboarding feedback what a more tailored experience should communicate and how completion will be validated.

Written by the indexing model from the issue text.