Use siteSpace title instead of space title in search

[zenoachtig]

We were exposing the space's internal title in search instead of the variant/siteSpace title.

[changeset-bot]

🦋 Changeset detected

Latest commit: 9e5aec9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
gitbook	Patch

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[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-9a2b8w8xf-gitbook.vercel.app	✅
Cloudflare	https://0a7b9b24-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-9a2b8w8xf-gitbook.vercel.app/url/gitbook.com/docs	https://0a7b9b24-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-9a2b8w8xf-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://0a7b9b24-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	-	Sep 22, 2025, 3:59 PM
v2-cloudflare (Inspect)	✅ No changes detected	-	Sep 22, 2025, 2:35 PM
v2-vercel (Inspect)	✅ No changes detected	-	Sep 22, 2025, 4:02 PM