fix(ui): don't treat numeric usernames as phone numbers

[thiskevinwang]

Description

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:

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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview, Comment	May 13, 2026 1:24pm

[changeset-bot]

🦋 Changeset detected

Latest commit: e11a8bb

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	Patch
@clerk/chrome-extension	Patch

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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: 14916a9d-614d-4be8-b6db-266184f2d086

📥 Commits

Reviewing files that changed from the base of the PR and between ace9af6 and e11a8bb.

📒 Files selected for processing (3)

• .changeset/quiet-dancers-carry.md
• packages/ui/src/utils/__tests__/formatSafeIdentifier.test.ts
• packages/ui/src/utils/formatSafeIdentifier.ts

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

• .changeset/quiet-dancers-carry.md

---

📝 Walkthrough

Walkthrough

This PR changes formatSafeIdentifier's early-return guard to require that the input does not start with '+' before bypassing phone formatting, adds a test asserting "4245554242" is returned unchanged, and includes a changeset entry documenting the fix.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The description contains only the template boilerplate without any meaningful details about the changes, testing instructions, or implementation context.	Fill in the description template with specific details about the fix, how to test it, and the rationale for the changes made.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: preventing numeric usernames from being treated as phone numbers, which aligns with all modifications across the test, implementation, and changeset files.
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: e11a8bb