fix(desktop/xdg): enable xdg home dirs, add XDG_DESKTOP_DIR (for JUCE-based audio plugins)

Author: mrtnvgr

modules/desktop/core/default.nix

@@ -10,7 +10,7 @@
     ./adb.nix
     ./wallpaper.nix
     ./kvm.nix
-    ./xdg-portal.nix
+    ./xdg.nix
 
     ./rices
     ./guiServers

modules/desktop/core/xdg-portal.nix

@@ -0,0 +1,17 @@
+{ pkgs, config, lib, user, ... }: {
+  config = lib.mkIf config.modules.desktop.enable {
+    home-manager.users.${user} = {
+      xdg.enable = true;
+    };
+
+    environment.sessionVariables = {
+      "XDG_DOCUMENTS_DIR" = "/home/${user}/.local/documents";
+    };
+
+    xdg.portal = {
+      enable = true;
+      config.common.default = "*";
+      extraPortals = [ pkgs.xdg-desktop-portal-gtk ];
+    };
+  };
+}