Fix local development console errors

[areibman]

📥 Pull Request

📘 Description
Eliminates excessive console errors in local development by conditionally disabling PostHog analytics and suppressing expected 401 API authentication warnings. This provides a significantly cleaner console, improving the local developer experience.

🧪 Testing

• Confirmed PostHog-related 401/404 and MIME type errors are absent in local development when PostHog keys are not set.
• Verified verbose 401 API authentication errors are suppressed in the development console.
• Ensured core application functionality (e.g., sign-in redirection) remains intact.
• Validated PostHog analytics still initialize and function correctly when configured for non-local environments.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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