🛡️ Sentinel: [CRITICAL] Fix Path Traversal in SetPortrait

[mleem97]

🚨 Severity: CRITICAL
💡 Vulnerability: The SetPortrait method in CustomEmployeeManager.cs used an un-sanitized employeeId in a Path.Combine call to load image files, enabling a Path Traversal vulnerability (CWE-22).
🎯 Impact: If a malicious employeeId was provided through another vector, it could lead to arbitrary file reads (and potentially other issues depending on context) on the host filesystem.
🔧 Fix: Added a boundary check to validate employeeId against Path.GetInvalidFileNameChars() and .. before attempting to construct the file path and load the portrait image, ensuring safe file system operations. If the ID is invalid, it falls back to the default fallback image.
✅ Verification: Ran the test suite via dotnet test to confirm compilation and existing functionality remain intact.

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PR created automatically by Jules for task 2695135055185402733 started by @mleem97

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[codacy-production]

Up to standards ✅

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