Fix various styling issues

[zenoachtig]

Fix three small visual issues

• Fix sidebar showing on no-toc pages in the gradient theme
• Fix variant selector truncating incorrectly in header when sections are present
• Fix page cover alignment on lg screens without TOC
• Fix rounded corners of navigation cards and prev/next pagination
• Make stepper steps more vibrant (on non-muted themes)

[changeset-bot]

🦋 Changeset detected

Latest commit: 04f9696

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

This PR includes changesets to release 1 package

Name	Type
gitbook	Patch

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[github-actions]

Summary of the deployments:

Version 1

Version	URL	Status
Latest commit	https://f268350d.gitbook-open.pages.dev	✅
PR	https://pr3283.gitbook-open.pages.dev	✅

Version 2

Version	URL	Status
Vercel	https://gitbook-v2-209wzyms9-gitbook.vercel.app	✅
Cloudflare	https://a254dd4a-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	v1	2v	2c
GitBook	https://f268350d.gitbook-open.pages.dev/gitbook.com/docs	https://gitbook-v2-209wzyms9-gitbook.vercel.app/url/gitbook.com/docs	https://a254dd4a-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://f268350d.gitbook-open.pages.dev/gitbook.gitbook.io/test-gitbook-open	https://gitbook-v2-209wzyms9-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://a254dd4a-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

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Build	Status	Details	Updated (UTC)
customers-v1 (Inspect)	✅ No changes detected	-	Jun 7, 2025, 11:20 PM
customers-v2 (Inspect)	👍 Changes approved	80 changed	Jun 7, 2025, 11:22 PM
default (Inspect)	👍 Changes approved	4 changed	Jun 7, 2025, 11:22 PM
v2-cloudflare (Inspect)	👍 Changes approved	4 changed	Jun 7, 2025, 11:23 PM
v2-vercel (Inspect)	👍 Changes approved	4 changed	Jun 7, 2025, 11:24 PM