What is the legal right of the husband to the marital apartment that he fully furnished, and to the investment amount he paid to the wife's father, after the wife filed a khul' case, and are the wife and her father entitled to take everything?

The divorced woman is entitled to her full Mahr (dowry), and she has the right to demand the deferred part of the Mahr. If the husband refuses, she can deduct it from the investment amount based on the issue of al-Zafar (gaining one's right by force). If it is customary for the list of movable assets to be part of the Mahr, the woman is entitled to them. The same applies to the furnishing of the apartment if it was agreed upon as compensation for the advance part of the Mahr. Conversely, if the wife seeks khul' (divorce at the instance of the wife) in return for compensation, the husband has the right to demand it.