Is it ok if I leave my iphone 13 on magsafe overnight everynight

Just to clarify, even if you don't used optimized charging (I recommend you do) you will not harm your iPhone leaving it on the MagSafe charger overnight.

Here is an excellent User Tip on battery charging by one of out top members. I would follow his recommendations (and look at the comments from other top members).

When to charge your iPhone or iPad - Apple Community

As long as you follow optimized battery charging, you are good to go! 😉