supabase / supabase / 29837675851

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chore(studio): polish vercel deploy-button new project interstitial (#48113)

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

Studio UI polish for the Vercel deploy-button new-project connect flow
(DEPR-616 follow-up).

## What is the current behavior?

- Deploy-button project creation still used
`VercelIntegrationWindowLayout` (top bar + Docs/Support footer) while
install and choose-project already use shared `InterstitialLayout`
- The remove-integration note sat as a floating admonition above the
form
- Advanced / internal-only config sections could show double dividers,
and the Oriole radio bottom border could clip inside the collapsible

## What is the new behavior?

- Deploy-button new-project uses `InterstitialLayout` with
`VercelIntegrationLogo` and `VercelIntegrationFooter`, matching the
other Vercel connect surfaces
- Regular `/new` project creation is unchanged; Panel chrome is only
flattened when `isVercelIntegrationFlow` is set
- Removes unused `VercelIntegrationWindowLayout` /
`IntegrationWindowLayout`
- Fixes Advanced/Internal-only dividers and collapsible border clipping

| Before | After |
| --- | --- |
| <img width="965" height="1107" alt="Supabase"
src="https://github.com/user-attachments/assets/99c1225c-c9e5-4fac-bd64-17920403e447"
/> | <img width="965" height="1107" alt="Create Vercel Project Supabase"
src="https://github.com/user-attachments/assets/c42bff96-5f9f-4c8b-8f3c-093e380f90ed"
/> |

## Additional context

### Testing

With Studio running locally and while signed in:

1. Open
`http://localhost:8082/integrations/vercel/<your-org-slug>/deploy-button/new-project`
2. Confirm the interstitial card: Vercel + Supabase logo pair, “Create a
new project” title, form fields, and the muted remove-integration footer
under the card
3. Confirm there is no old window chrome (no “Marketplace Connector” /
“Deploy Button” top ba... (continued)

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