- Add select_timezone() function using tzselect for user-friendly timezone selection
- Integrate timezone selection as Step 2 in installation process
- Update timezone setting to use selected timezone for installed system
- Store selected timezone in /tmp/selected_timezone for use during configuration
- Update total steps from 9 to 10 to accommodate new timezone step
- Maintain backward compatibility with preseed timezone configuration
- Provide clear user interface for timezone selection during installation