gui: dolphin: init

Add dolphin, a graphical file manager with
kio-fuse and kio-extras to support mounting of filesystems

modules/programs/gui/dolphin.mod.nix

@@ -0,0 +1,17 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  inherit (lib.modules) mkIf;
+  inherit (config.modules.system) isGraphical;
+in {
+  config = mkIf isGraphical {
+    environment.systemPackages = with pkgs; [
+      kdePackages.dolphin
+      kdePackages.kio-fuse #to mount remote filesystems via FUSE
+      kdePackages.kio-extras #extra protocols support (sftp, fish and more)
+    ];
+  };
+}