Is it permissible to supplicate for the regrowth of hair and healing from hereditary baldness, or is that considered an transgression in supplication and a sign of discontent with divine decree? And are there any Sharia-compliant recommendations for healing from this condition?

Supplicating for healing or for the removal of affliction is permissible and does not constitute an transgression in prayer. Rather, transgression occurs when one asks for something that contradicts Allah's cosmic laws. For every ailment there is a cure, including illnesses for which no cure is believed to exist. The Messenger of Allah, peace and blessings be upon him, said: "For every disease there is a cure. If the cure for a disease is found, it will be cured by the permission of Allah, the Mighty and Exalted." It is recommended to supplicate frequently and to recite the Quran with the intention of healing, especially Surat Al-Fatihah, which is considered one of the greatest healing remedies. Ibn Al-Qayyim experienced its efficacy in healing from illnesses. The response to supplication comes in one of three ways: hastened fulfillment, stored for the Hereafter, or averting evil from the supplicant. One must supplicate with certainty of being answered, while also taking the necessary means and seeking treatment from doctors.