🧪 Add test case for SurveyEngine.submitAnswer precondition

[alfieprojectsdev]

• 🎯 What: Added a test case to verify that SurveyEngine.submitAnswer throws an error when called before the survey is active.
• 📊 Coverage: This covers the scenario where submitAnswer is invoked without a valid currentNodeId, ensuring the survey state is properly initialized.
• ✨ Result: Improved test coverage and reliability of the SurveyEngine class, catching potential misuse of the API.

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PR created automatically by Jules for task 6654204324358910017 started by @alfieprojectsdev

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