Improve accessibility in published docs

[tgargula]

Improvements

• fix pinch-to-zoom on Android
• improve aria labels on "Ask assistant" buttons
• improve contrast on "Sponsored via GitBook"
• update the bun.lock

Demo

Ask button has an aria-label

Aria-label in the Ask button matches button content

Color of "Sponsored via GitBook" changed to increase contrast ratio to more than 4.5:1

Pinching to zoom is possible on Android devices (DevTools)

[linear-code]

RND-10355

[changeset-bot]

⚠️ No Changeset found

Latest commit: 03431b3

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-e8appxh4x-gitbook.vercel.app	✅
Cloudflare	https://3aee94ab-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-e8appxh4x-gitbook.vercel.app/url/gitbook.com/docs	https://3aee94ab-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-e8appxh4x-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://3aee94ab-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	15 changed	May 27, 2026, 11:08 AM
customers-v2-vercel (Inspect)	👍 Changes approved	2 changed	May 27, 2026, 11:07 AM
v2-cloudflare (Inspect)	👍 Changes approved	5 changed	May 27, 2026, 11:13 AM
v2-vercel (Inspect)	👍 Changes approved	6 changed	May 27, 2026, 11:13 AM