fix: exclude React Native from browser %c gate

[shubh73]

📚 Description

isClient() (typeof window !== 'undefined') is used to gate %c console formatting, but React Native polyfills window, so the logger takes the browser branch and metro renders the format string and CSS args as literal text on every log.

Adds an isBrowser() helper (window + document + non–React Native navigator.product and routes the two %c gates.

isClient() / isServer() are unchanged — they remain a typeof window inverse pair, so existing consumers keep their semantics.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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[github-actions]

Thank you for following the naming conventions! 🙏

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[pkg-pr-new]

npm i https://pkg.pr.new/evlog@306

npm i https://pkg.pr.new/@evlog/nuxthub@306

commit: 4966be8