Fix anchor URL resolution

[clairechabas]

Proposed changes

Clicking anchor links was appending the hash to the URL instead of replacing the existing hash.

Demo

Before
https://www.loom.com/share/bdbd4b34eeb54227996667e66c485086

After
https://www.loom.com/share/0db353e0128e42bb90f7f56ee9e1412d

[linear-code]

RND-10851

[changeset-bot]

⚠️ No Changeset found

Latest commit: c1717a5

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-c2yhe7v6u-gitbook.vercel.app	✅
Cloudflare	https://55c8aac8-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-c2yhe7v6u-gitbook.vercel.app/url/gitbook.com/docs	https://55c8aac8-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-c2yhe7v6u-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://55c8aac8-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

[argos-ci]

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Build	Status	Details	Updated (UTC)
customers-v2-cloudflare (Inspect)	👍 Changes approved	1 changed	May 11, 2026, 1:41 PM
customers-v2-vercel (Inspect)	✅ No changes detected	-	May 11, 2026, 1:42 PM
v2-cloudflare (Inspect)	👍 Changes approved	9 changed	May 11, 2026, 1:48 PM
v2-vercel (Inspect)	👍 Changes approved	7 changed	May 11, 2026, 1:47 PM