The table has a really muscular right-angled solidity to it. It’s wonderful... but I think that means you need some color and curves with the chairs! Judy’s suggestion seems to me like it matches too much with the table and doesn’t jnfuse life. I think the red west elm suggestion is a great one. But I think your paint is slightly on the cool side, so I’d recommend this blue-ish colored chair— https://www.target.com/p/2pc-copley-upholstered-dining-chair-project-62-153/-/A-52962328?preselect=54210220#lnk=sametab

Sounds like a fireplace re-do might be a longer-term fix. In the meantime, I'd paint the mantle a dark brown, a similar colour to your end tables. It's not trim and shouldn't be white. It pops out too much in the white colour. Another idea that doesn't involve any ripping-out is to go right over the existing mantle using a mantle slipcover in wood. Here's one of many how-to's on the internet. If you stained your brick as well, you could have a whole new look. https://www.fwmadebycarli.com/2011/01/making-of-slip-covered-mantel.html

As far as the mason jars on the wall, this is what I had envisioned but I just want everything to be uniform and match is all. Ignore the dark wood... I would prob stain it the same color as the table is stained so it matches... or does it even matter?

Not a designer. Based on examples here on Houzz, it looks like she can use any chair. Even her current chairs.