🛡️ Sentinel: [HIGH] Fix path traversal vulnerability in SetPortrait

[mleem97]

• 🚨 Severity: HIGH
• 💡 Vulnerability: SetPortrait uses employeeId in Path.Combine without independent validation. If an invalid or malicious employeeId reaches this method (e.g., via deserialization bypass), it causes a Path Traversal vulnerability.
• 🎯 Impact: An attacker could potentially load arbitrary files from the filesystem.
• 🔧 Fix: Added a defense-in-depth input validation check in SetPortrait that safely bypasses file loading and correctly hits the fallback logic (teal portrait) if the ID is invalid.
• ✅ Verification: Tests passed successfully.

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PR created automatically by Jules for task 17889115179320231016 started by @mleem97

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[codacy-production]

Up to standards ✅

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