Improve search error handling and token redirection

[conico974]

This PR fixes 2 issues :

• Expired VA token on server actions, would not properly redirect because of CORS errors. Fixed by mimicking server actions redirect in the middleware.
• No error handling on search. If there was an error you could end up in 2 situation, either it would show no result or it would indefinitely show the loading state. Fixed by showing an error and display a Try again button that will reload the page (it is necessary when a new deployment has occured and the server action id has changed)

[linear]

RND-8100 Search is timing out after page being open for a long time

[changeset-bot]

⚠️ No Changeset found

Latest commit: e1d3c58

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-v2-3omaglc83-gitbook.vercel.app	✅
Cloudflare	https://a88f52ba-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-3omaglc83-gitbook.vercel.app/url/gitbook.com/docs	https://a88f52ba-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-3omaglc83-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://a88f52ba-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 approved	4 changed, 4 added	Oct 16, 2025, 12:43 PM
v2-cloudflare (Inspect)	👍 Changes approved	6 changed	Oct 16, 2025, 12:11 PM
v2-vercel (Inspect)	👍 Changes approved	3 changed	Oct 16, 2025, 12:11 PM