Potential fix for code scanning alert no. 7: Information exposure through an exception

[netpersona]

Potential fix for https://github.com/netpersona/Popcorn/security/code-scanning/7

To fix the information exposure vulnerability, replace the specific exception message with a generic error message in the API response. Log the real exception details on the server side (using the standard Python logging module, which is already imported in the code). This change should be applied only to the except Exception as e: block inside the upload_theme endpoint in app.py (lines 1468-1469). Also, add a server-side log record, including the exception and stack trace, to facilitate debugging.

Implementation steps:

• In the except Exception as e: block at line 1468, replace the current return with:
  • A call to logging.exception() to log the full exception (message and traceback).
  • A generic user-facing message, e.g., "Failed to read file.".
• No new imports are needed (since import logging is already present).

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