fix(secrets): restore unsaved-changes guard for settings tab navigation #4009

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Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_8452e9d8-9765-4ef2-b777-17af9d9c1fb1

✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit 522f3e2. Configure here.}