Code review response: identify critical issues in import/export implementation

[Copilot]

Performed code review of import/export feature additions. Identified critical issues that need resolution before merge.

Issues Identified

Critical:

• .DS_Store macOS system file committed to repository
• Scenario upload handler missing (HTML input exists, no event listener)
• Original "Download Initial/Final Config" functionality removed without replacement

Code Quality:

• Inconsistent error handling (mixed alert() and console.error())
• Missing null checks in loadConfigurationFromJSON() module iteration

Positive Aspects

• Clean separation with parseConfigurationJSON() in utils.js
• Improved pathfinder error messages with actionable feedback
• Proper resource cleanup (URL revokeObjectURL, file input reset)

Awaiting confirmation to proceed with fixes.

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