Fix overflowing section groups

[zenoachtig]

• Fixes truncated sections when the section group popover overflows
• Improve the layout of sections to be more space-efficient
• Break into multiple section columns per group later (5 → 8)

Before, after

[linear]

RND-8886 Section Groups - Section titles seem to overflow - Ionos

[changeset-bot]

🦋 Changeset detected

Latest commit: edcfedd

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	URL	Status
Vercel	https://gitbook-v2-14vc7x8kf-gitbook.vercel.app	✅
Cloudflare	https://834308bd-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-14vc7x8kf-gitbook.vercel.app/url/gitbook.com/docs	https://834308bd-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-14vc7x8kf-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://834308bd-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	52 changed	Dec 15, 2025, 4:43 PM
v2-cloudflare (Inspect)	👍 Changes approved	18 changed	Dec 15, 2025, 4:48 PM
v2-vercel (Inspect)	👍 Changes approved	17 changed	Dec 15, 2025, 4:48 PM