What should one do if they unintentionally laugh aloud due to the Imam's poor recitation during prayer, and do they need to do anything to atone for this sin?

Laughter invalidates the prayer if it is audible and consists of two or more letters. The prayer must be repeated if the laughter was invalidating. The worshipper must observe humility in his prayer and avoid distracting thoughts. However, if laughter occurred unintentionally and involuntarily, it appears to be excused based on the Prophet's (peace be upon him) saying: "Indeed, Allah has overlooked for my Ummah their mistakes, their forgetfulness, and what they are compelled to do."