导入图片排班表：改进黑白主题检测

mower/utils/qrcode.py

@@ -58,7 +58,7 @@ def export(plan: Dict, img: Image.Image, theme: str = "light") -> Image.Image:
 
 def decode(img: Image.Image) -> Optional[Dict]:
     img = img.convert("RGB")
-    if img.getpixel((0, 0)) == BLACK:
+    if img.getpixel((0, 0))[0] < 127:
         img = ImageChops.invert(img)
     result = []
     while len(data := pyzbar.decode(img)):