Improve DOM safety checks for post body enhancements, especially for iOS Safari

[seer-by-sentry]

Fixes ECENCY-NEXT-VM6. The issue was that: iOS Safari's strict cross-origin policies block iframe video embeds, causing DOM elements to be null, leading to TypeError when accessed.

• Implemented a more robust isElementSafe function to check if the post body element is safe to access, including handling potential SecurityError exceptions in iOS Safari due to cross-origin iframe restrictions.
• Added more specific error handling and logging for iOS Safari related issues, such as null is not an object errors and SecurityError exceptions, to aid in debugging.
• Ensured that the element's isConnected property is checked safely, with a fallback mechanism if the check fails due to security restrictions.
• Improved error logging to provide more context when enhancements fail, including specific messages for DOM structure issues and cross-origin security errors.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 29630

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