This commit introduces two new methods, _get_previous_tracking_point and _get_next_tracking_point, to the VideoEditor class. These methods allow for the retrieval of tracking points from the previous and next frames that contain tracking data, enhancing navigation capabilities. The rendering logic has been updated to utilize these methods, ensuring that the previous (red) and next (green) tracking points are displayed correctly during video playback. Additionally, the specification has been updated to reflect these changes in the display of tracking points.