Salam alaykom wr wb sisters,
This reminder is first for me and all sisters who will read this.
The reminder benefits the muslim believer.
Hadith related from Aisha (Allah be well pleased with her) by al-Hakim al-Tirmidhi that the Prophet said: "Shirk (polytheism) is more hidden in my Umma than the creeping of a black ant across a black stone on a dark night whithout moon light ".
Wishing " good luck" to someone is against Tawhid. Our destiny was written only by Allah azawajel long time ago before creation. "Luck" is a wrong concept. If something happen to you, it's not related to bad luck/good luck but only on Allah's will.
Sourate 21 eya 35: "Every soul will taste death. We burden you with adversity and prosperity—a test. And to Us you will be returned. "
This expression " good luck" is not a muslim one. Even if we don't have the niya to commit shirk, using it is not making Allah happy of us ; and furthermore, it's not in the Sunnah.
If someone want to wish positive things to someone else, we have bunch of islamic expression like Allah maak ect..
Why are we triing to imitate westerners ??
We say la-ilaha il-Allah....but actions must follow words.