Current Behavior: The SfSlider widget doesn't support keyboard focus or navigation. When users tab through form elements, the slider is skipped, and there's no way to control the slider using keyboard inputs such as arrow keys. This creates accessibility issues for keyboard-only users.

Expected behavior: The SfSlider should be focusable via keyboard tabbing and should respond to arrow key inputs to adjust its value, similar to Flutter's native Material Slider. When focused, the slider should provide visual feedback (such as a focus border, highlighted thumb, or tooltip) to indicate that it has keyboard focus. This implementation would improve accessibility and provide a better user experience for keyboard navigation.