🛡️ Sentinel: [CRITICAL] Fix PII leak on Sentry feedback error

[google-labs-jules]

🚨 Severity: CRITICAL
💡 Vulnerability: User email was set in the global Sentry scope, but cleanup was skipped if the submit call threw an error.
🎯 Impact: PII could leak into subsequent unrelated crash reports or events.
🔧 Fix: Used a defer block to guarantee cleanup.
✅ Verification: Verified locally via tests and linting.

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PR created automatically by Jules for task 4700658484670768647 started by @TytaniumDev

[google-labs-jules]

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