Fix errors

hakuimg/dither.py

@@ -37,5 +37,6 @@ def run(
     src,
     k: int = 3,
 ) -> tuple[Image.Image, list[list[str|float]]]:
-    def calc()
+    def calc():
+        pass
     return Image.fromarray(result)

hakuimg/pixel.py

@@ -9,6 +9,8 @@ import cv2
 from PIL import Image
 import numpy as np
 
+from hakuimg.dither import dithering
+
 
 INFLATE_FILTER = [
     None,