Does stealing from a house after repentance and supplication to Allah prevent the supplication from being answered, and what is the Sharia ruling on this matter?

Repentance from theft is immediately obligatory, as it is one of the major sins. The stolen money must be returned to its owner immediately. The non-acceptance of supplication may be due to unlawful gain, as mentioned in the prophetic hadith. Allah loves those who repent and rejoices at the repentance of His servant, so do not despair of Allah's mercy.