improve numpy typing

mypy.ini

@@ -1,4 +1 @@
 [mypy]
-
-[mypy-protobuf_generated_python.*]
-ignore_errors = True

src/extract_otp_secrets.py

@@ -59,7 +59,7 @@
 
 try:
     import cv2
-    import numpy as np  # TODO use numpy types if available
+    import numpy as np
 
     try:
         import tkinter
@@ -405,15 +405,15 @@ def get_color(new_otps_count: int, otp_url: str) -> ColorBGR:
 
 
 # TODO use cv2 types if available
-def cv2_draw_box(img: Any, raw_pts: Any, color: ColorBGR) -> Any:
+def cv2_draw_box(img: list[tuple[Any, Any]], raw_pts: list[tuple[Any, Any]], color: ColorBGR) -> np.ndarray[Any, np.dtype[np.int32]]:
     pts = np.array([raw_pts], np.int32)
     pts = pts.reshape((-1, 1, 2))
     cv2.polylines(img, [pts], True, color, BOX_THICKNESS)
     return pts
 
 
 # TODO use cv2 types if available
-def cv2_print_text(img: Any, text: str, line_number: int, position: TextPosition, color: ColorBGR, opposite_len: Optional[int] = None) -> None:
+def cv2_print_text(img: cv2.UMat, text: str, line_number: int, position: TextPosition, color: ColorBGR, opposite_len: Optional[int] = None) -> None:
     window_dim = cv2.getWindowImageRect(WINDOW_NAME)
     out_text = text
     if opposite_len: