feat(sale): Surface vendor errors from custom webooks

[JCSanPedro]

Hi👋, please ensure the PR title follows the below standards:

• PR is titled with conventional commit style naming: type(scope): message. For example: feat(passport): my new feature
• If you have introduced modification that necessitates immediate adjustments by this SDK's users to their applications, clients, or integrations to avert disruptions to existing features or functionalities, add a ! after the type(scope), for example feat(passport)!: my new breaking feature

Summary

This change to the primary sales api will return the vendor's custom error if either the quote or signing step fails due to the vendor's webhooks return a 400/403/404 response.

This PR updates the SaleErrorView such that it will render the vendor's custom error if present.

Detail and impact of the change

Added

Changed

Deprecated

Removed

Fixed

Security

Anything else worth calling out?

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 3fe4458

Command	Status	Duration	Result
nx run-many -p @imtbl/sdk,@imtbl/checkout-widge...	✅ Succeeded	4s	View ↗
nx affected -t build,lint,test	✅ Succeeded	3s	View ↗

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☁️ Nx Cloud last updated this comment at 2026-03-18 23:24:52 UTC

[naveen-imtb]

Why unknown?