🛡️ Sentinel: [MEDIUM] Prevent internal error leakage in OAuth callback

[davidruzicka]

🛡️ Sentinel: [MEDIUM] Prevent internal error leakage in OAuth callback

💡 Vulnerability: The handleCallback method in ExternalOAuthProvider was returning a raw string Internal Server Error during token exchange upon catch blocks, lacking a correlation ID and not strictly adhering to the standard 500 error format requested by Sentinel guidelines (which mandates logging a correlation ID and presenting a generic client message referencing it).
🎯 Impact: This missing structured logging makes debugging harder and diverges from the internal error leakage policy outlined in .jules/sentinel.md.
🔧 Fix: Imported generateCorrelationId and used it to log the full error stack with the correlationId internally, and sent back a sanitized Internal error (correlation ID: <id>) string to the client. Updated the test mock expectation.
✅ Verification: Ran npm run test and vitest run --config vitest.config.ts src/auth/oauth-provider.test.ts. Tests pass correctly.

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PR created automatically by Jules for task 1982166344946449096 started by @davidruzicka

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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