feat(modules/graphical): add pulsemixer package

modules/hm/default.nix

@@ -14,6 +14,7 @@ in
   imports = [
     inputs.home-manager.nixosModules.home-manager
     ./hardware.nix
+    ./programs/default.nix
     ./programs/editor.nix
     ./programs/de.nix
   ];

modules/hm/programs/default.nix

@@ -0,0 +1,18 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  username = config.nixosModules.mainUser;
+in
+{
+  config = lib.mkMerge [
+    {
+      home-manager.users."${username}".home.packages = with pkgs; [
+        pulsemixer
+      ];
+    }
+  ];
+}