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Lenovo X1 carbon is what you are looking for. I got one (10th Gen) and slapped fedora on it and it’s been absolutely awesome.
Battery life could be better, but I haven’t tweaked it.
Good luck finding a quality new laptop with Linux support that also has a rj45 port. Framework might be an option though. But I just use a gigabit Ethernet usb3 adapter and it works fine
Airsonic Advanced and DSUB on Android are pretty good options since DSUB has advanced local caching options.
I aquire my music then run it through Picard for tagging which places it into my NAS where it is mounted to airsonic and jellyfin containers for consumption.
The jellyfin apps have gotten a lot better and I find myself using feishin and finamp more often lately.