Use more strict context ID for images during preview

[SamyPesse]

No description provided.

[linear]

RND-7183 Images fail to load in preview v2 because of invalid signatures

[changeset-bot]

⚠️ No Changeset found

Latest commit: 5e24582

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.

This PR includes no changesets

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[github-actions]

Summary of the deployments:

Version 1

Version	URL	Status
Latest commit	https://f43a8ad6.gitbook-open.pages.dev	✅
PR	https://pr3261.gitbook-open.pages.dev	✅

Version 2

Version	URL	Status
Vercel	https://gitbook-v2-2xmdtyrfb-gitbook.vercel.app	✅
Cloudflare	https://e10394ec-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	v1	2v	2c
GitBook	https://f43a8ad6.gitbook-open.pages.dev/gitbook.com/docs	https://gitbook-v2-2xmdtyrfb-gitbook.vercel.app/url/gitbook.com/docs	https://e10394ec-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://f43a8ad6.gitbook-open.pages.dev/gitbook.gitbook.io/test-gitbook-open	https://gitbook-v2-2xmdtyrfb-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://e10394ec-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-v1 (Inspect)	✅ No changes detected	-	May 23, 2025, 9:55 AM
customers-v2 (Inspect)	👍 Changes approved	79 changed	May 23, 2025, 10:48 AM
default (Inspect)	✅ No changes detected	-	May 23, 2025, 9:56 AM
v2-cloudflare (Inspect)	✅ No changes detected	-	May 23, 2025, 9:56 AM
v2-vercel (Inspect)	✅ No changes detected	-	May 23, 2025, 9:56 AM