feat(gtk): prefer dark mode

users/gandalf/modules/dconf.nix

@@ -1,10 +1,13 @@
 { lib, nixosConfig, ... }: {
 
-  dconf.settings = lib.mkIf nixosConfig.bchmnn.virtualisation.enable {
-    "org/virt-manager/virt-manager/connections" = {
+  dconf.settings = {
+    "org/virt-manager/virt-manager/connections" = lib.mkIf nixosConfig.bchmnn.virtualisation.enable {
       autoconnect = [ "qemu:///system" ];
       uris = [ "qemu:///system" ];
     };
+    "org/gnome/desktop/interface" = {
+      "color-scheme" = "prefer-dark";
+    };
   };
 
 }

users/gandalf/modules/gui/default.nix

@@ -2,6 +2,7 @@
 
   imports = with lib; with nixosConfig.bchmnn;
     optionals gui.enable [
+      ./gtk.nix
       ./programs
     ] ++ optionals (gui.enable && elem "sway" gui.flavour) [
       ./sway

users/gandalf/modules/gui/gtk.nix

@@ -0,0 +1,13 @@
+{ ... }: {
+
+  gtk = {
+    enable = true;
+    gtk3.extraConfig = {
+      gtk-application-prefer-dark-theme = 1;
+    };
+    gtk4.extraConfig = {
+      gtk-application-prefer-dark-theme = 1;
+    };
+  };
+
+}