[UI/Core Split] Refactor StringToEnum in Utilities

[benfleuty]

The StringToEnum method in Utilities.cs provides a generic way to convert a string to an enum. This is a useful utility function, but its location in a general Utilities class can be refactored into a more specific utility class focused on type conversion or string manipulation within the core layer.

Action:

1. Create a new core-level utility class for type conversion or string utilities (e.g., TypeConverterUtils.cs or StringUtils.cs).
2. Move the StringToEnum method to this new class.
3. Update any code that uses StringToEnum to reference the new class.
4. Add or update tests for the string-to-enum conversion logic.