Is the husband obligated to return his wife's salaries that she voluntarily deposited in the home, and is he bound to fulfill his promise to her to register the apartment in both their names despite advice against independent living?

If the wife explicitly states that she is donating her money to her husband, or if custom dictates such, then she is not entitled to demand it back. However, if there was no explicit statement or customary practice, then the matter depends on her intention; if she intended to reclaim what she spent, she is permitted to demand it back, but if she intended it as a donation, she is not entitled to demand anything. As for purchasing an apartment with shared ownership, this depends on the nature of the relationship between the spouses.