- Added mouse delta tracking to InputState for improved mouse movement feedback.
- Introduced FPS mode toggle in GUI demo, allowing for relative mouse movement and cursor visibility control.
- Implemented input service methods for mouse position, delta, wheel, and key/action state checks.
- Updated SDL input service to handle relative mouse mode and mouse grabbing more effectively.
- Enhanced window service with methods to manage mouse grabbing and cursor visibility.
- Updated interface definitions for IInputService and IWindowService to include new functionalities.
