better consistency, add dotfiles for takamaki and new features

modules/global/nixos.nix

@@ -8,7 +8,7 @@
         "flakes"
       ];
 
-      gc = {
+      gc = lib.mkIf (!config.features.applications.cli.nh.enable) {
         automatic = true;
         persistent = true;
         dates = "Sun 05:00";
@@ -90,5 +90,16 @@
         isStandalone = lib.mkDefault false;
       };
     };
+
+    xdg.portal = {
+      enable = true;
+      xdgOpenUsePortal = true;
+      config.common.default = "*";
+      extraPortals = with pkgs; [ xdg-desktop-portal-gtk xdg-desktop-portal-gnome ];
+    };
+
+    services.gnome.gnome-keyring.enable = true;
+
+    environment.pathsToLink = [ "/share/xdg-desktop-portal" "/share/applications" ]; # from description of this home-manager option: https://search.nixos.org/options?channel=26.05&query=xdg.portal.enable&source=home_manager&type=options
   };
 }