The handbook that came with the frame says that the frame will take up to a 130mm travel fork.
IME, overforking bikes by 20 mm or so is an improvement, provided you don’t start thrashing over big drops. The recommended fork is really more about warranty than anything, if you ride it within sensible limits, it won’t put any significant extra stress on the frame.
Depending on the head tube diameter, it might be possible to fit a tapered steerer fork in there if you replace the lower headset bearings. If so, a 27.5″ fork would allow you to transfer the fork to a newer frame in the future, even if you stick with the current 26″ wheel. I would check that out before spending money on a new fork.
I put a Suntour Epicon onto my old commuter bike (straight steerer, 9 mm QR). It works fine for a fairly cheap XC fork.