Refactor: Add type hinting and docstrings to EntranceController methods

[pyob-bot]

Summary of Changes

• Added missing type hints to detect_symbolic_ripples and update_analysis_for_single_file methods within EntranceController.
• Included descriptive docstrings for both methods to improve code readability and maintainability.
• Explicitly defined the return type for update_analysis_for_single_file as None.

Technical Impact

• Code Quality: Enhances static analysis capabilities by providing explicit type signatures, reducing potential runtime type errors.
• Maintainability: Improves developer experience through better IDE autocompletion and documentation clarity.
• Compatibility: No changes were made to the underlying logic, ensuring full backward compatibility with existing workflows.