CBC Employee Cleanupv3

Refactor export functionality and enhance organizational data handling

- Updated Excel export sheet names for clarity, changing 'Cleaned Data' to 'Masterdata' and 'Current Users' to 'Active Users'.
- Improved matching logic in ProcessingController to prioritize exact matches for 'Department/Branch' and 'Group Name'.
- Enhanced name column detection in MatchingEngine to better identify full name columns with flexible matching strategies.
- Updated ResultsView to reflect changes in dataset naming for improved user understanding.

CBC Employee Cleanup

Refactor application startup and enhance splash screen functionality

- Integrated a splash screen display during application startup for improved user experience.
- Updated the main application entry point to show the splash screen before initializing the main controller.
- Modified the splash screen class to manage progress bar visibility and update the default root window upon closure.
- Adjusted the main controller to remove direct splash screen handling, promoting better separation of concerns.