Is it said to one who gloats: "May Allah guide you and set your affairs aright," or "May Allah guide us and guide you," and have both been mentioned in the Sunnah?

If a Muslim sneezes and praises Allah, those who hear him respond with "Yarhamukallah" (May Allah have mercy on you). The sneezer then responds with "Yahdeekumullah wa yuslihu balakum" (May Allah guide you and rectify your affairs), or "Yaghfirullah li wa lakum" (May Allah forgive me and you), or "Aafana Allahu wa iyakum minan-nar, yarhamukumullah" (May Allah protect us and you from the Hellfire, may Allah have mercy on you), or "Yarhamuna Allahu wa iyakum, wa yaghfir lana wa lakum" (May Allah have mercy on us and you, and forgive us and you). As for responding with "Yahdeena wa yahdeekumullah" (May Allah guide us and you), it has no basis in the Sunnah or the statements of the Companions.