fix(ui): position mosaic link button underline from the font metric

[maxyinger]

Description

small update to use from-font vs 2px offset for link buttons. I think skip ink auto is already the browser default, but just added in there to be more explicit.

visual change isn't much if anything, but makes this much more resilient to people using other fonts vs hardcoding 2px for offset

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

🤖 Generated with Claude Code

[vercel]

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Project	Deployment	Actions	Updated
clerk-js-sandbox	Ready	Preview	Sep 17, 2026 6:12pm UTC
swingset	Ready	Preview	Sep 17, 2026 6:12pm UTC

[changeset-bot]

🦋 Changeset detected

Latest commit: 446c028

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

This PR includes changesets to release 2 packages

Name	Type
@clerk/mosaic	Patch
@clerk/swingset	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository YAML (base), Organization UI (inherited)

Review profile: ASSERTIVE

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📥 Commits

Reviewing files that changed from the base of the PR and between ed222b7 and 446c028.

📒 Files selected for processing (2)

• .changeset/button-link-underline-from-font.md
• packages/mosaic/src/components/button/button.styles.ts

🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

• clerk/clerk_go (manual)
• clerk/dashboard (manual)
• clerk/accounts (manual)
• clerk/backoffice (manual)
• clerk/clerk (manual)
• clerk/clerk-docs (manual)
• clerk/cloudflare-workers (manual)
• clerk/cli (auto-detected)
• clerk/clerk-ios (auto-detected)
• clerk/clerk-android (auto-detected)

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📝 Walkthrough

Walkthrough

The three link button variants replace the fixed 2px underline offset with textDecorationSkipInk: 'auto' and textUnderlinePosition: 'from-font'. A patch changeset documents the update.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested reviewers: alexcarpenter

Merge Risk: ⚪ Minimal · up to 446c0

The PR only adjusts link underline rendering and documents the change; no actionable production risk is evidenced.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: Mosaic link button underlines now use font metrics instead of a fixed offset.
Description check	✅ Passed	The description accurately explains the underline positioning change, its purpose, and its expected visual impact.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Commit to this branch
• Create a new PR

---

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commit: 446c028

[alexcarpenter]

TIL!