Where do things live on Linux?

The documentation for the Mailspring Theme Starter refers to the theme location on macOS, but not on Linux.

Where do these files live on Linux?

On Linux, for the native package at least (as opposed to Snapcraft), it’s in ~/.config/Mailspring/packages/THEME_NAME.

It might be in the same place for snap, or else under ~/snap/Mailspring or some such. I’d appreciate if anyone could confirm that.