Is the husband's statement to his wife: "If you leave it a second time, I will hide it from you and you will never see it again" considered an allusive divorce (kinayah), a conditional divorce, or merely a fleeting thought (waswas)?

Not every utterance by the husband constitutes a divorce. Rather, the utterance must be explicit in divorce or one of its allusions accompanied by intention. Allusions are words that could imply divorce, such as: "Go back to your family," or "You are unlawful to me." However, words that do not resemble divorce or signify separation do not constitute divorce, even if intended. The phrase mentioned in the question does not indicate the initiation or suspension of divorce. It is advised to disregard these intrusive thoughts.