I used to work in a suuuper fancy chocolate shop. We had extensive training on how chocolate is made - it wasn't just a retailer, they were seriously passionate.
It was impressed upon us that you should never ever put chocolate in the fridge. it ruins it. Have you ever noticed the white layer that forms on chocolate that has been refrigerated? That's called "blooming". It would happen in the shop sometimes if the door was open on a particularly cold winter's day. We had to keep an eye out for it, and any chocolates that had bloomed would have to go in the bin.
The only time I would put chocolate in the fridge (personally) is if there was a serious heatwave, and it was a choice between slightly less good chocolate or melty ruined chocolate.
HOWEVER, having said all that, I am a firm believer that you should do what you like with your own stuff!! If you like it cold and refrigerated, then crack on and enjoy.
One of the things that bugs me the most is when people get irritated if you do something the "wrong" way, with your own food. I have no time at all for people who love to let you know that they are personally offended by the fact that you've put jam/cream on your scone first, milk in your earl grey, ice in your whiskey, or ordered your steak the wrong shade of pink. Being jokey is fine but good grief some people act like you've just insulted their family 🙄
So:
Technically - room temperature.
In reality - totally your choice!