🛡️ Sentinel: [HIGH] Fix PII leak in Sentry SDK scope

[google-labs-jules]

🚨 Severity: HIGH
💡 Vulnerability: User email was not cleared from Sentry global scope if network request failed.
🎯 Impact: PII leak into subsequent events.
🔧 Fix: Use a defer block to clear the Sentry scope.
✅ Verification: Verified via linting and manual tests.

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PR created automatically by Jules for task 11498456677132784935 started by @TytaniumDev

[google-labs-jules]

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