Kabbalat Shabbat on the Night of Shiva

On the Friday night of Shiva, should the mourner recite Kabbalat Shabbat and Bameh Madlikin?

It is customary for the mourner to recite Kabbalat Shabbat as usual, including Bameh Madlikin, since he is leading the prayer. (If he prays in a synagogue following the Sephardic rite where Bameh Madlikin is not recited, even if he prays according to the Ashkenazi rite, it is likely that he does not recite it.)

In Beit Yosef, Yoreh De'ah, Siman 393, it is written in the name of Kol Bo (Siman 114): "A mourner within the seven days does not leave his house, even on Shabbat, but they pray in his house, and in the weekday prayer, they do not say Tachanun, Lamnatzeach, and Shir Mizmor, and also in the evening prayer of Shabbat, they do not say Brachah Achat Me'ein Sheva and Bameh Madlikin." This is also cited in Ba'er HaGolah, Shpad, section 6. However, Maharil Diskin permitted saying Bameh Madlikin, as the custom to say it is considered public mourning. This is also written in Aruch HaShulchan, Siman 90, section 5. And the custom is that the mourner says everything with the congregation, as the custom of the entire congregation is to say it, it is considered part of the order of prayer, and everything that is part of the order of prayer, the mourner says, as written in Mishnah Berurah, Siman 50, section 1: "There are places where they do not say Eizehu Mekoman in the house of the mourner because Torah study is forbidden, and this is not correct, because everything that is part of the order of the day is not considered Torah study for the mourner, as ruled in Siman 594, section 4." And although there are communities that do not say it, it is likely that the order of prayer is determined according to the rite and place of prayer.