How close from Earth could a wandering flare red dwarf star be without causing havoc?

Rewriting the question to clarify:
The time and location is now in our current Earth. A wandering red dwarf flare star (like Wolf 359) is moving towards our Solar System.
The question: How close could it be to Earth without disrupting our civilization?.

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How close from Earth could a wandering flare red dwarf star be without causing havoc?

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