🧹 Remove unused variable month_folder_id

[yj9404]

🎯 What: Removed the unused variable month_folder_id assignment in create_worklog.py at line 105.
💡 Why: To improve code health and maintainability by removing dead code. The function find_or_create_folder is still called for its side effect of creating the folder if it doesn't exist.
✅ Verification: Verified by running the test suite (python -m unittest discover), ensuring all tests pass and functionality remains unbroken.
✨ Result: Cleaner, more readable code without unused variable warnings.

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PR created automatically by Jules for task 14441641742902270361 started by @yj9404

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