desktop: replace GNOME with XFCE fallback; fix keyring popup

Remove GNOME DE (gnome-keyring, tracker, extensions, shell dconf
settings) and replace with a lightweight XFCE fallback session so
ly offers an alternative if Hyprland fails after an update. Add
nautilus explicitly as a standalone package. Eliminates the keyring
unlock prompt that appeared in Nautilus on Hyprland sessions.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

settings/gnome.nix

@@ -1,11 +1,10 @@
+# settings/gnome.nix — display manager, lightweight fallback session, GTK/Qt theming
 { config, pkgs, lib, inputs, ... }:
 {
   config = lib.mkIf (lib.elem config.networking.hostName [ "FredOS-Gaming" "FredOS-Macbook" ]) {
-    # Enable Gnome
     services.xserver.enable = true;
     services.displayManager.ly.enable = true;
     services.displayManager.defaultSession = "hyprland";
-    services.desktopManager.gnome.enable = true;
     boot.plymouth.enable = false;
 
     services.displayManager.ly.settings = {
@@ -13,16 +12,16 @@
       bigclock   = true;
     };
 
+    # Lightweight fallback session — if Hyprland fails after an update,
+    # ly will list XFCE as an alternative without pulling in GNOME's
+    # keyring, tracker, or other heavyweight background services.
+    services.xserver.desktopManager.xfce.enable = true;
+
     # Flatpak for ad-hoc app installs via Bazaar
     services.flatpak.enable = true;
 
-    # Add extensions, packages, and terminal
     environment.systemPackages = with pkgs; [
-      ghostty
+      nautilus             # file manager — works standalone without a GNOME DE
-      gnomeExtensions.blur-my-shell
-      gnomeExtensions.just-perfection
-      gnomeExtensions.appindicator
-      gnomeExtensions.hot-edge
       adwaita-icon-theme
       gnome-themes-extra
       adwaita-icon-theme-legacy
@@ -40,18 +39,6 @@
       ];
     };
 
-    # mutter VRR — stylix handles theme/icon dconf entries
-    programs.dconf.profiles.user.databases = [{
-      settings = {
-        "org/gnome/desktop/interface" = {
-          icon-theme = "WallpaperAdwaita";
-        };
-        "org/gnome/mutter" = {
-          experimental-features = [ "variable-refresh-rate" ];
-        };
-      };
-    }];
-
     qt = {
       enable = true;
       platformTheme = "gnome";
@@ -61,15 +48,12 @@
     programs.xwayland.enable = true;
     programs.dconf.enable = true;
 
-    # Home Manager GNOME settings
     home-manager.users.fred = { config, lib, pkgs, ... }: {
       # Stylix's qt target only supports qtct; disable it to silence the warning.
       stylix.targets.qt.enable = false;
       # Minimal titlebars — stylix manages the GTK theme; we layer our
-      # headerbar shrink on top via programs.gtk.*.extraCss.
+      # headerbar shrink on top via stylix.targets.gtk.extraCss.
       gtk.enable = true;
-      # gtk.gtk3.extraCss / gtk4.extraCss are no-ops once stylix owns the
-      # theme — extra CSS has to go through stylix.targets.gtk.extraCss.
       stylix.targets.gtk.extraCss = ''
         headerbar { min-height: 0; padding: 0; margin: 0; }
         headerbar .title { font-size: 0; }
@@ -82,64 +66,6 @@
           color: @headerbar_fg_color;
         }
       '';
-
-      # GNOME dconf settings — stylix owns colour-scheme, gtk-theme,
-      # cursor-theme and accent-color now.
-      dconf.settings = {
-        "org/gnome/desktop/interface" = {
-          enable-hot-corners = false;
-        };
-
-        # Wallpaper now set by stylix's gnome target.
-
-        # Keyboard input sources
-        "org/gnome/desktop/input-sources" = {
-          sources = [
-            (lib.hm.gvariant.mkTuple [ "xkb" "gb" ])
-            (lib.hm.gvariant.mkTuple [ "xkb" "no" ])
-          ];
-        };
-
-        # Window manager keybindings
-        "org/gnome/desktop/wm/keybindings" = {
-          close = ["<Super>q"];
-          toggle-fullscreen = ["<Super>f"];
-        };
-        "org/gnome/desktop/wm/preferences" = {
-          resize-with-right-button = lib.hm.gvariant.mkBoolean true;
-          button-layout = "";
-        };
-
-        # Shell keybindings
-        "org/gnome/shell/keybindings" = {
-          show-screenshot-ui = ["<Shift><Super>s"];
-        };
-
-        # Custom keybindings
-        "org/gnome/settings-daemon/plugins/media-keys" = {
-          home = ["<Super>e"];
-          control-center = ["<Super>i"];
-          custom-keybindings = [
-            "/org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/custom0/"
-          ];
-        };
-
-        "org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/custom0" = {
-          name = "Terminal";
-          command = "ghostty";
-          binding = "<Super>t";
-        };
-
-        # Mouse acceleration
-        "org/gnome/desktop/peripherals/mouse" = {
-          accel-profile = "flat";
-        };
-
-        # Just Perfection extension
-        "org/gnome/shell/extensions/just-perfection" = {
-          window-demands-attention-focus = true;
-        };
-      };
     };
   };
 }