Support OpenAPI one-operation-per-page mode

[nolannbiron]

• Render operation pages headlessly: the OpenAPI block omits its own title/description so the page renders them instead (new headless flag plumbed through the block context)
• Show an HTTP method badge next to operation links in the sidebar ToC, with deprecated operations struck through
• Add getOpenAPIOperationPageProps to read method/deprecated from a page's computed OpenAPI source, and formatOpenAPIMethod for badge labels

Demo:

[linear-code]

RND-11298

[changeset-bot]

🦋 Changeset detected

Latest commit: cd56056

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

This PR includes changesets to release 2 packages

Name	Type
@gitbook/react-openapi	Patch
gitbook	Patch

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[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-6fsh4rz0v-gitbook.vercel.app	✅
Cloudflare	https://9c079918-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-6fsh4rz0v-gitbook.vercel.app/url/gitbook.com/docs	https://9c079918-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-6fsh4rz0v-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://9c079918-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	4 changed	Jun 19, 2026, 8:26 AM
customers-v2-vercel (Inspect)	👍 Changes approved	4 changed	Jun 19, 2026, 8:26 AM
v2-cloudflare (Inspect)	👍 Changes approved	6 changed	Jun 19, 2026, 8:31 AM
v2-vercel (Inspect)	👍 Changes approved	6 changed	Jun 19, 2026, 8:30 AM