refactor: shared desktop profile for enzo + kusanagi

profiles/desktop.nix becomes a username-agnostic shared base (niri, dconf, the
dark-theme portal fix, greetd, pipewire base, gpg agent, graphics, Firefox with
blank-home/no-bookmarks prefs, common desktop tools, font base). Both hosts now
import it.

Per-host desktop config splits into machines/<host>/desktop.nix:
- enzo: Adwaita cursor + monospace, HiDPI console font, yambar, hwebs groups.
- kusanagi (new file): GNOME/X11, printing/avahi/udisks2, pro-audio
  (rtkit/jack/32-bit), gpg ssh support, richer fonts, Bibata cursor, henz
  desktop groups, waybar/nm-applet.

Shared profile is username-agnostic (enzo=hwebs, kusanagi=henz): shared desktop
tools moved to environment.systemPackages, per-user groups stay in machine
files. Firefox now owned by the shared profile, so its redundant enable is
dropped from profiles/apps.nix. Dark theme + Firefox tweaks now apply to both
hosts. Both configurations build.

Assisted-by: Claude:claude-opus-4-8

1 files changed, 3 insertions, 2 deletions

diff --git a/machines/enzo/default.nix b/machines/enzo/default.nix
index 0e9d6e4..bcb92cb 100644
--- a/machines/enzo/default.nix
+++ b/machines/enzo/default.nix
@@ -3,8 +3,9 @@
 
 {
   imports = [
-    # enzo's own minimal desktop (not the shared profiles/desktop.nix). Add
-    # ../../profiles/dev.nix or apps.nix here, or one-off packages below, as needed.
+    # Shared desktop base + enzo-only extras. Add ../../profiles/dev.nix or
+    # apps.nix here, or one-off packages below, as needed.
+    ../../profiles/desktop.nix
     ./desktop.nix
 
     inputs.disko.nixosModules.disko