Isn’t there space in the back for a power bank? Or what are those wires back there?

Well I'll leave the tech stack to you, but if you want any help on the UX/design end of things I'm happy to put in some effort

Are you sticking with it despite all its issues? I am a product engineer and the UX is really dicey. I have a strong urge to improve on it but I'm not confident in the foundation I'd be building on top of

It seems like a good candidate for a hypermedia-type front end as reactivity is minimal on a forum. That would hugely simplify and speed up development. Are you familiar with HTMX? Basically you render everything on the server and send it in pieces as needed and avoid needing to manage state on the front end. I haven't seen any features on Lemmy that would be noticeably less reactive. Anyway just a suggestion