You are right. The Qur'an leaves no room for superstitions. Interpretation of dreams is among them.
The brilliant Mu'min Imam Raghib Ispahani in his Al-Mufridaat Fi Ghareebil Qur’an, includes interpretation of dreams in JIBT.
4:51 Are you not aware of those who, after receiving their share of the Book, believe in JIBT and Taaghoot? And then these deniers of the truth claim that they are better guided on to the right path than those who have chosen to be graced with belief.
[JIBT = False doctrines = ‘Occult’ sciences, baseless mysteries, magic, future-telling, astrology, clairvoyance, evil eye, good and bad omens, amulets, dream interpretation, and prophecies, palm-reading, soothsaying, superstitions of all kind, jinn or demon-possession of people, exorcism, blowing verses and senseless words on people or in food and drink, counting names on rosaries. TAAGHOOT = Any force believed to have Divine powers = Evil humans who try to play god with their tyranny = Satan = Those who exploit people as religious leaders = Priests and monks = Mullahs and Sufis of any religion]
Look at another example of vision, understood by quite a few exponents as dream.
17:60 We said to you (O Prophet), “Your Sustainer encompasses all mankind, so We have given you the vision (of mankind’s unity)." Those who hinder this Plan will end up eating the bitter, pungent Tree of Division that is mentioned in the Qur’an. This vision and the Tree of Division shall be a test for them. Now We have conveyed a warning to them, yet, for a time it shall increase them in gross rebellion. [Vision: Mankind will become one community again. Division: 7:19, 14:26, 15:39, 17:60, 37:65, 38:82, 44:44]
After diligent reflection and after asking the great Quranic scholar and Mu'min of the 20th century, Malik Faisal Shaheed 1n 1972, I have always preferred to use VISION instead of a dream.