Canadian businessman Li Yonghui, who has been detained in China since 2019, is seen in this undated photo provided by his family. THE CANADIAN PRESS/HO Wang Yan **MANDATORY CREDIT** VANCOUVER — Wang Yan vividly recalls the last time she heard her husband’s voice, more than five years ago. It was Dec. 13, 2019, and Canadian citizen Li Yonghui had gone to a public square in Shijiazhuang, in China’s Hebei province, to exercise as he spoke to his wife in Canada by mobile phone. “Suddenly, the call ended, like someone was grabbing his phone. And I called other family (in China)…