Handle Download Failures More Gracefully in Electron Fiddle

[Manasvisingh12]

Description:
When a download fails (e.g., due to network issues), the error message is vague and does not suggest how to fix it.

Proposed Fix:

• Display a more user-friendly error message instead of just "Download failed".
• Provide suggestions like “Check your internet connection” or “Try again later”.
• Implement a retry mechanism to automatically retry the download if it fails.

Impact:
This will improve the user experience and help users troubleshoot issues easily.