fix: update npm username regex to support underscores and dots

[NandkishorJadoun]

Description

Current regex for npm usernames was restrictive. It was preventing avatars from loading for valid users that contain underscores or dots in their handles, such as rich_harris. I've updated the regex to correctly support these characters.

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Project	Deployment	Actions	Updated (UTC)
npmx.dev	Ready	Preview, Comment	Feb 7, 2026 9:38am

2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs.npmx.dev	Ignored	Preview	Feb 7, 2026 9:38am
npmx-lunaria	Ignored		Feb 7, 2026 9:38am

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The change updates the NPM username validation regex in shared/schemas/user.ts to allow . and _ characters in the middle segment of usernames, alongside existing alphanumeric and - characters. Maximum length, trimming, required flag, validation messages and overall schema flow remain unchanged. No other logic or exported/public declarations were modified. One line was changed.

🚥 Pre-merge checks | ✅ 1

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description check	✅ Passed	The pull request description clearly relates to the changeset, explaining that the regex was updated to support underscores and dots in npm usernames to fix avatar loading.

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✨ Finishing touches

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• Post copyable unit tests in a comment

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Actionable comments posted: 1