Is it possible to interpret a disturbing dream after Salatul-Istikhara with the intention of guiding a non-Muslim person, and what is its effect on achieving this goal?

The love of Allah indicates a person's goodness and makes them among those about whom Allah said: "He loves them and they love Him." And whoever loves Allah, Allah casts His love into their heart, as happened with the man who loved reciting "Say: He is Allah, the One," so Allah loved him. The sign of true love is following the Prophet, peace be upon him; "Say: If you love Allah, then follow me, and Allah will love you and forgive you your sins." If Allah loves His servant, He protects them, answers their prayers, and shields them from what they dislike, as stated in the Hadith (definition) Qudsi. Inviting creation to Allah is a great deed that does not require seeking divine guidance through Istikhara, but rather initiative and wisdom. As for bad dreams, they are from Satan, and one must seek refuge with Allah from them, spit lightly to the left, change sides, and not pay attention to them.