It is always helpful to post your location. Hardly any gardening question can be answered without regard to location/ climate/ weather. What kind of temperatures are you dealing with? Where are you located that you are still needing to bring them in at night?
It's a mixed bag of stuff, mostly cold season stuff, but then the tomatoes which are not particularly cold tolerant. Broccoli and chard once hardened are exceptionally cold tolerant and likely could/ should be staying out all the time unless you are somewhere up near the Arctic circle.
"Spritzing" a few times a day sounds like a lot in terms of keeping the leaves moist all the time, which can conduce to fungal diseases, and yet if you are not really watering the soil, they could also be under- watered, in terms of having enough water at the roots for the plant to take up. They could paradoxically be too wet and too dry at the same time.
A couple pictures would really help us to help you figure out what is wrong. I always worry when people mention limp / spindly seedlings. If they are looking like these:
https://statebystategardening.com/images ... ff%201.jpg
https://f.tqn.com/y/gardening/1/W/s/Q/1/ ... 3-copy.jpg
they could be victim of damping off disease, which would be very bad news. But I don't want to borrow trouble if that is not what you are talking about.