🛡️ Sentinel: [CRITICAL] Fix path traversal in CustomEmployeeManager.SetPortrait

[mleem97]

🚨 Severity: CRITICAL
💡 Vulnerability: The SetPortrait method uses employeeId directly in Path.Combine without path traversal validation. Direct calls or deserialization could bypass validation in Register.
🎯 Impact: An attacker could perform path traversal attacks to load arbitrary files or bypass sandbox restrictions.
🔧 Fix: Wrapped the file loading logic with path validation for employeeId, checking against Path.GetInvalidFileNameChars() and ... The fallback UI logic is preserved. Added // [Security] Prevent path traversal bypass in image loading.
✅ Verification: Ran dotnet build and dotnet test to confirm changes do not break existing functionality.

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PR created automatically by Jules for task 5713255648943601266 started by @mleem97

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[codacy-production]

Up to standards ✅

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