Fix: Stripe Tokenization Error on 'Pick a Plan' Onboarding Page

🔍 Problem Statement
As a new Pelcro account owner, I experience a Stripe error "This integration surface is unsupported for publishable key tokenization" on the 'Pick a Plan for your Business' page, which blocks me from completing onboarding entirely.

💡 User Story
As a new account owner, I want to complete plan selection and payment without a Stripe tokenization error, so that I can set up my Pelcro account and begin using the platform.

🎯 Definition of Done
- Given a new account in the onboarding flow, when the user selects a plan and enters payment details, then no Stripe tokenization error is thrown and onboarding completes successfully.
- This change impacts the onboarding UI (plan selection payment form) and Stripe integration configuration.
- Limitations: root cause is likely a Stripe publishable key misconfiguration; fix must not break existing Stripe flows.

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When I log in to my account I am presented with the ‘Pick a Plan for your Business’ page. I am able to select an option, but then I have to fill in credit card details in the lower section. When I do this I get a Stripe error ‘This integration surface is unsupported for publishable key tokenization’. I then follow the link to Stripe and make the requested change but it seems to make no difference to Pelcro. I am therefore stuck on this page forever ! Please help !