fix: Validate external URLs before rendering as links

gandalf_automationrequested to merge
improve-external-url-handling into develop

Summary

  • Add isSafeExternalUrl utility function to validate URL protocols
  • Apply validation to Twitter profile links from Hiveposh API
  • Prevents potentially unsafe URL schemes (e.g., javascript:, data:) from being rendered as clickable links

Test plan

  • Verify Twitter badge still renders for profiles with valid Twitter URLs
  • Verify Twitter badge does not render if API returns invalid URL scheme

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