[Asahi] Adding a global panelight gtk theme.

Signed-off-by: jmug <u.g.a.mariano@gmail.com>

hosts/asahi/configuration.nix

@@ -110,6 +110,8 @@
     # Terminal
     ghostty.packages.aarch64-linux.default
     kitty
+    # Theming
+    palenight-theme
   ];
 
   fonts = {

hosts/asahi/home.nix

@@ -58,6 +58,35 @@ in
     stateVersion = "25.05"; # Do not change!!!
   };
 
+  gtk = {
+    enable = true;
+    gtk3 = {
+      extraConfig = {
+        gtk-application-prefer-dark-theme = 1;
+      };
+    };
+    gtk4 = {
+      extraConfig = {
+        gtk-application-prefer-dark-theme = 1;
+      };
+    };
+    theme = {
+      name = "palenight";
+      package = pkgs.palenight-theme;
+    };
+  };
+  dconf.settings = {
+    "org/gnome/desktop/interface" = {
+      color-scheme = "prefer-dark";
+    };
+  };
+  xdg.configFile = {
+    "gtk-4.0/assets".source = "${config.gtk.theme.package}/share/themes/${config.gtk.theme.name}/gtk-4.0/assets";
+    "gtk-4.0/gtk.css".source = "${config.gtk.theme.package}/share/themes/${config.gtk.theme.name}/gtk-4.0/gtk.css";
+    "gtk-4.0/gtk-dark.css".source = "${config.gtk.theme.package}/share/themes/${config.gtk.theme.name}/gtk-4.0/gtk-dark.css";
+  };
+
+
   programs.walker = {
     enable = true;