Enhance crop application with motion tracking offset adjustments in VideoEditor

This commit updates the crop functionality to include motion tracking offsets when applying crop adjustments. It ensures that the crop center aligns with tracked positions if motion tracking is enabled, improving the accuracy of cropping during video editing. This enhancement builds on previous updates to motion tracking and crop handling, further refining the user experience.

croppa/main.py

@@ -2262,11 +2262,22 @@ class VideoEditor:
         original_height, original_width = self.current_display_frame.shape[:2]
         available_height = self.window_height - (0 if self.is_image_mode else self.TIMELINE_HEIGHT)
 
-        # Step 1: Apply crop (subtract crop offset)
+        # Step 1: Apply crop (subtract crop offset, including motion tracking offset)
         display_x = video_x
         display_y = video_y
         if self.crop_rect:
             crop_x, crop_y, crop_w, crop_h = self.crop_rect
+            
+            # Apply motion tracking offset if enabled
+            if self.motion_tracker.tracking_enabled:
+                current_pos = self.motion_tracker.get_interpolated_position(self.current_frame)
+                if current_pos:
+                    # Move crop center to tracked point (same logic as in apply_crop_zoom_and_rotation)
+                    tracked_x, tracked_y = current_pos
+                    new_x = int(tracked_x - crop_w // 2)
+                    new_y = int(tracked_y - crop_h // 2)
+                    crop_x, crop_y = new_x, new_y
+            
             display_x -= crop_x
             display_y -= crop_y