修复摄像头上线后自动重连失败：重连前先取消旧重连计时器

hookvision/main_window.py

@@ -1274,6 +1274,7 @@ class MainWindow(QMainWindow):
                     side = "left" if cam.position == CameraPosition.LEFT else "right"
                     cur = self.left_player if side == "left" else self.right_player
                     if cur is None:
+                        self._cancel_rtsp_retry(side)
                         self._retry_rtsp(side)
         for bucket in self.buckets:
             bars = self._bucket_signal_labels.get(bucket.id)