Fix site section/variants links in url preview mode

[spastorelli]

Need https://github.com/GitbookIO/gitbook-x/pull/18555 for complete fix.

[linear]

RND-7341 Invalid JWT error in the site preview for a site behinds VA

[changeset-bot]

⚠️ No Changeset found

Latest commit: d48bce9

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[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-b56i84jj8-gitbook.vercel.app	✅
Cloudflare	https://b46d9515-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-b56i84jj8-gitbook.vercel.app/url/gitbook.com/docs	https://b46d9515-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-b56i84jj8-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://b46d9515-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)	⚠️ Changes detected (Review)	4 changed	Jul 7, 2025, 2:50 PM
v2-cloudflare (Inspect)	⚠️ Changes detected (Review)	1 changed	Jul 7, 2025, 2:53 PM
v2-vercel (Inspect)	⚠️ Changes detected (Review)	4 changed	Jul 7, 2025, 2:53 PM

[spastorelli]

Closing in favor of a better/cleaner solution. Synced with Samy during a huddle, and we paired on this PR.