On hermes /tmp is a 16 GB tmpfs; a full xz build can exhaust it mid-run. WORK now
honours an env override (matching OUT) so it can be pointed at the NVMe.
- Add bread-theme to the binaries baked into /etc/skel from bakery state.
- Run `bread-theme generate` first in the Hyprland autostart so the shared
GUI stylesheet ($XDG_RUNTIME_DIR/bread/theme.css) exists before breadbar /
breadbox / bos-settings paint (they also live-reload it on change).