supabase / supabase / 30331714205

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fix(studio): close Vercel create popup on cancel (#48371)

## What kind of change does this PR introduce?

Bug fix / UX polish.

## What is the current behavior?

Cancel on the Vercel create interstitial redirects to Vercel’s `next`
URL. That finishes the install flow and shows “Completing installation…”
/ “Installation complete”, even though the user cancelled. The Deploy
Button job still proceeds and fails. The button was also labelled
“Return to Vercel”, which read like an alternate success path.

| Before |
| --- |
| <img width="719" height="118" alt="Create Vercel Project Supabase"
src="https://github.com/user-attachments/assets/c7ad261a-f132-4226-b460-21ec267595c0"
/>|
| <img width="800" height="599" alt="95801"
src="https://github.com/user-attachments/assets/6d235c4b-be90-4d5e-89bc-a68933f9dc46"
/> |

## What is the new behavior?

- _Return to Vercel_ button now labelled **Cancel**
- **Cancel** closes the popup via `window.close()` (same honest abort as
manually closing the window)
- If the browser blocks programmatic close, Cancel is replaced by muted
fallback copy: “Close window to cancel” (`role="status"` /
`aria-live="polite"`)
- Cancel is left-aligned with `justify-between` when there’s no
additional-costs block; with costs, both actions stay on the right
- Removes the free-limit hint line about returning to Vercel (Cancel
makes that self-evident)
- Success path is unchanged: after create, we still redirect via `next`
- `/new` Cancel still navigates into Studio (`cancelAction: 'studio'`).
This is unchanged behaviour

| After (Fallback) |
| --- |
| <img width="713" height="103" alt="img"
src="https://github.com/user-attachments/assets/95aafc0d-1c3d-4093-9681-88ad0a40f9fe"
/> |

## Additional context

Follow-up to #48311. Vercel’s `next` URL has no documented cancel/abort
status, so closing the popup is the correct escape hatch.

### To test

Full Deploy Button popup cancel can’t be verified on prod until this
merges. Locally:

1. Open Studi... (continued)

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