feat(ui): Add fontFamilyMono variable

[alexcarpenter]

Description

Adds new fontFamilyMono variable option to be used in ConfigureSSO work.

docs: clerk/clerk-docs#3369

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:

[changeset-bot]

🦋 Changeset detected

Latest commit: ac1783f

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

This PR includes changesets to release 2 packages

Name	Type
@clerk/ui	Minor
@clerk/chrome-extension	Patch

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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview, Comment	May 14, 2026 0:29am

[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: CHILL

Plan: Pro

Run ID: a5ef325b-7820-446e-aa66-a12e5c7c0c6b

📥 Commits

Reviewing files that changed from the base of the PR and between f282355 and ac1783f.

📒 Files selected for processing (1)

• .changeset/font-family-mono-variable.md

✅ Files skipped from review due to trivial changes (1)

• .changeset/font-family-mono-variable.md

---

📝 Walkthrough

Walkthrough

This pull request adds monospace font family customization to the theme system. A new optional fontFamilyMono property is introduced to the Variables type with documentation describing its use for monospaced text. The createFonts function is updated to extract this property and include it in its returned object alongside existing main and buttons entries. The typography foundation exports a new fonts.mono CSS variable that defaults to a standard monospace font stack (ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace).

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The pull request title accurately describes the main change: adding a new fontFamilyMono variable to the UI package, which is exactly what the changeset implements.
Description check	✅ Passed	The description is directly related to the changeset, explaining that it adds a new fontFamilyMono variable option for use in ConfigureSSO work with a reference to supporting documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

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commit: ac1783f

[jacekradko]

LGTM