Gracefully handle OpenAPI fetch errors

[conico974]

Implement error handling for OpenAPI fetching.

[changeset-bot]

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Latest commit: 38753f7

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[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-iupmygt4u-gitbook.vercel.app	✅
Cloudflare	https://5afc2a4f-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-iupmygt4u-gitbook.vercel.app/url/gitbook.com/docs	https://5afc2a4f-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-iupmygt4u-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://5afc2a4f-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

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Build	Status	Details	Updated (UTC)
customers-v2 (Inspect)	✅ No changes detected	-	Jul 8, 2025, 3:28 PM
v2-cloudflare (Inspect)	✅ No changes detected	-	Jul 8, 2025, 3:34 PM
v2-vercel (Inspect)	👍 Changes approved	6 changed	Jul 8, 2025, 3:30 PM

[SamyPesse]

I think you should use the same error handling as data fetcher