kusanagi: drop full GNOME session, keep just Nautilus + Loupe

The GNOME desktop was only enabled for its apps, but it pulled in ibus,
whose XDG autostart fired ibus-daemon under our niri session and popped
an "IBus has been started" notification on every login. Remove
services.desktopManager.gnome (and the unused X server/GDM) and instead
install nautilus and loupe directly, enabling gvfs so Nautilus keeps
trash, network shares, and removable-media mounting.

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

1 files changed, 15 insertions, 10 deletions

diff --git a/machines/kusanagi/desktop.nix b/machines/kusanagi/desktop.nix
index 368022e..15bec13 100644
--- a/machines/kusanagi/desktop.nix
+++ b/machines/kusanagi/desktop.nix
@@ -1,19 +1,20 @@
 # kusanagi-only desktop extras. The shared niri/dark/audio/firefox base comes
 # from ../../profiles/desktop.nix (imported in ./default.nix); this file holds
-# the workstation's GNOME session, printing/scanning, pro-audio, richer fonts,
-# and cursor theme. (Hardware-specific audio/NAS/server config lives in
+# a few GNOME apps (no GNOME session), printing/scanning, pro-audio, richer
+# fonts, and cursor theme. (Hardware-specific audio/NAS/server config lives in
 # ./default.nix.)
 { pkgs, ... }:
 
 {
-  # --- X11 + GNOME (alongside the niri session) ---
-  services.xserver.enable = true;
-  services.xserver.xkb = {
-    layout = "us";
-    variant = "";
-  };
-  services.displayManager.gdm.enable = false;
-  services.desktopManager.gnome.enable = true;
+  # --- GNOME apps without the GNOME session ---
+  # We run niri, not GNOME, so the full `services.desktopManager.gnome` isn't
+  # enabled: it dragged in gnome-shell, GDM, an X server, and — the reason this
+  # went away — ibus, whose XDG autostart fired `ibus-daemon` under niri and
+  # popped the "IBus has been started" notification on every login. Instead we
+  # install just the GNOME apps we use (see systemPackages below) and enable
+  # gvfs so Nautilus keeps trash, network shares, and removable-media mounting.
+  # dconf (needed for their gsettings) comes from the shared desktop profile.
+  services.gvfs.enable = true;
 
   # --- Printing / discovery / disks ---
   services.printing = {
@@ -115,5 +116,9 @@
   environment.systemPackages = with pkgs; [
     waybar
     networkmanagerapplet
+
+    # GNOME apps we use standalone (no GNOME session; see gvfs note above).
+    nautilus # file manager
+    loupe # image viewer
   ];
 }