🛡️ Sentinel: [MEDIUM] Fix SentrySDK state leak

[google-labs-jules]

🚨 Severity: MEDIUM
💡 Vulnerability: User email was set on the global SentrySDK scope but not reliably cleared if the submission threw an error.
🎯 Impact: The users email could persist and leak onto all subsequent crash reports during that session.
🔧 Fix: Moved the cleanup logic into a defer block immediately after setting the user.
✅ Verification: Verified via unit test suite and local linting checks.

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PR created automatically by Jules for task 15223861556316667233 started by @TytaniumDev

[google-labs-jules]

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