Add virtualization support and adjust defaults

- Disable printing by setting `printEnable = false`.
- Add a new `virualization` module enabling libvirtd, virt‑manager,
  qemuGuest and spice‑vdagentd; enable it on the desktop host.
- Change default applications: enable GIMP, disable Pixieditor.
- Bump Helium AppImage to version 0.14.4.1 with updated hash.
- Lower notification sound volume from 0.5 to 0.1.
- Refactor Bash and Fish aliases: `upd` now updates flakes,
  `upg` performs OS switch, and new helper aliases are added.

hosts/Garand-Desktop/printers.nix

@@ -1,5 +1,5 @@
 {
-  printEnable = true;
+  printEnable = false;
 
   ensureDefaultPrinter = "Brother-T525W";
 

hosts/Garand-Desktop/system-modules.nix

@@ -4,6 +4,7 @@ _: {
   */
   docker.enable = true; # Docker: container runtime and management
   virtualbox.enable = false; # VirtualBox: PC emulator
+  virualization.enable = true; # GUI application for managing local and remote virtual machines through libvirt
   flatpak = {
     enable = true; # Flatpak: universal packaging system for Linux
     packages = {
@@ -97,9 +98,9 @@ _: {
     eyeOfGnome.enable = true; # Eye of GNOME: image viewer
     switcheroo.enable = false; # Switcheroo: file conversion tool
     freetube.enable = false; # FreeTube: privacy‑friendly YouTube client
-    gimp.enable = false; # GIMP: GNU Image Manipulation Program
+    gimp.enable = true; # GIMP: GNU Image Manipulation Program
     kdenlive.enable = true; # Kdenlive: video editing software
-    pixieditor.enable = true; # Pixieditor: Universal editor for all your 2D needs
+    pixieditor.enable = false; # Pixieditor: Universal editor for all your 2D needs
     plex.enable = false; # Plex: media player and server client
     jellyfin.enable = true; # Jellyfin: foss media player
     appImages.losslesscut.enable = true; # Losslesscut: Swiss army knife of lossless video/audio editing

hosts/Garand-Laptop/system-modules.nix

@@ -4,6 +4,7 @@ _: {
   */
   docker.enable = true; # Docker: container runtime and management
   virtualbox.enable = false; # VirtualBox: PC emulator
+  virualization.enable = false; # GUI application for managing local and remote virtual machines through libvirt
   flatpak = {
     enable = true; # Flatpak: universal packaging system for Linux
     packages = {

hosts/default/system-modules.nix

@@ -4,6 +4,7 @@ _: {
   */
   docker.enable = false; # Docker: container runtime and management
   virtualbox.enable = false; # VirtualBox: PC emulator
+  virualization.enable = false; # GUI application for managing local and remote virtual machines through libvirt
   flatpak = {
     enable = false; # Flatpak: universal packaging system for Linux
     packages = {

modules/core/default.nix

@@ -25,6 +25,7 @@
     ./user.nix
     ./ventoy.nix
     ./virtualbox.nix
+    ./virualization.nix
     ./xdg.nix
     ./xserver.nix
     ./zram.nix

modules/core/packages/appimages/helium.nix

@@ -4,8 +4,8 @@
   fetchurl,
 }: let
   pname = "helium";
-  version = "0.14.3.1";
+  version = "0.14.4.1";
-  hash = "sha256-umRDXcHlDRDWpdP4wxr81q+cUXkjiIxyg2AcJRFQaMA=";
+  hash = "sha256-91hO0NtjUxEZwUyMYe7RD1RfFIelYa8ExzLKRsLaZZo=";
 
   src = fetchurl {
     url = "https://github.com/imputnet/helium-linux/releases/download/${version}/helium-${version}-x86_64.AppImage";

modules/core/virualization.nix

@@ -0,0 +1,18 @@
+{
+  lib,
+  config,
+  ...
+}: {
+  options.virualization.enable = lib.mkEnableOption "Enable QEMU/KVM";
+
+  config = lib.mkIf config.virualization.enable {
+    virtualisation.libvirtd.enable = true;
+
+    programs.virt-manager.enable = true;
+
+    services = {
+      qemuGuest.enable = true;
+      spice-vdagentd.enable = true;
+    };
+  };
+}

modules/home/bash/aliases.nix

@@ -6,16 +6,16 @@
   programs.bash.shellAliases = {
     # GarandOS aliases
     pullos = "git -C /home/${username}/garandos pull";
-    upd = "nh os switch -H ${host} -d always";
+    upd = "sudo nix flake update --flake /home/${username}/garandos";
-    upg = "nh os switch -H ${host} --update  -d always";
+    upd-gh = "nix flake update --option access-tokens \"github.com=$(gh auth token)\" --flake /home/${username}/garandos";
-    upf = "sudo nix flake update --flake /home/${username}/garandos";
+    upd-pkgs = "sudo nix flake update --flake /home/${username}/garandos nixpkgs";
-    upf-gh = "nix flake update --option access-tokens \"github.com=$(gh auth token)\" --flake /home/${username}/garandos";
+    upd-pkgs-gh = "nix flake update --option access-tokens \"github.com=$(gh auth token)\" --flake /home/${username}/garandos nixpkgs";
-    upf-pkgs = "sudo nix flake update --flake /home/${username}/garandos nixpkgs";
+    upd-undo = "git -C /home/${username}/garandos restore /home/${username}/garandos/flake.lock";
-    upf-pkgs-gh = "nix flake update --option access-tokens \"github.com=$(gh auth token)\" --flake /home/${username}/garandos nixpkgs";
+    upg = "nh os switch -H ${host} -d always";
-    upf-undo = "git -C /home/${username}/garandos restore /home/${username}/garandos/flake.lock";
+    upg-upd = "nh os switch -H ${host} --update -d always";
-    upd-bt = "nh os boot -H ${host} -d always";
+    upg-bt = "nh os boot -H ${host} -d always";
-    upd-ts = "nh os test -H ${host} -d always";
+    upg-ts = "nh os test -H ${host} -d always";
-    upd-bd = "nh os build -H ${host} -d always";
+    upg-bd = "nh os build -H ${host} -d always";
     tui = "garandos-tui";
     ncg = "nh clean all --optimise";
 

modules/home/fish/aliases.nix

@@ -6,16 +6,16 @@
   programs.fish.shellAliases = {
     # GarandOS aliases
     pullos = "git -C /home/${username}/garandos pull";
-    upd = "nh os switch -H ${host} -d always";
+    upd = "sudo nix flake update --flake /home/${username}/garandos";
-    upg = "nh os switch -H ${host} --update  -d always";
+    upd-gh = "nix flake update --option access-tokens \"github.com=$(gh auth token)\" --flake /home/${username}/garandos";
-    upf = "sudo nix flake update --flake /home/${username}/garandos";
+    upd-pkgs = "sudo nix flake update --flake /home/${username}/garandos nixpkgs";
-    upf-gh = "nix flake update --option access-tokens \"github.com=$(gh auth token)\" --flake /home/${username}/garandos";
+    upd-pkgs-gh = "nix flake update --option access-tokens \"github.com=$(gh auth token)\" --flake /home/${username}/garandos nixpkgs";
-    upf-pkgs = "sudo nix flake update --flake /home/${username}/garandos nixpkgs";
+    upd-undo = "git -C /home/${username}/garandos restore /home/${username}/garandos/flake.lock";
-    upf-pkgs-gh = "nix flake update --option access-tokens \"github.com=$(gh auth token)\" --flake /home/${username}/garandos nixpkgs";
+    upg = "nh os switch -H ${host} -d always";
-    upf-undo = "git -C /home/${username}/garandos restore /home/${username}/garandos/flake.lock";
+    upg-upd = "nh os switch -H ${host} --update -d always";
-    upd-bt = "nh os boot -H ${host} -d always";
+    upg-bt = "nh os boot -H ${host} -d always";
-    upd-ts = "nh os test -H ${host} -d always";
+    upg-ts = "nh os test -H ${host} -d always";
-    upd-bd = "nh os build -H ${host} -d always";
+    upg-bd = "nh os build -H ${host} -d always";
     tui = "garandos-tui";
     ncg = "nh clean all --optimise";
 

modules/home/noctalia/settings/notifications/default.nix

@@ -21,7 +21,7 @@
     };
     sounds = {
       enabled = true;
-      volume = 0.5;
+      volume = 0.1;
       separateSounds = false;
       criticalSoundFile = "/home/${username}/garandos/modules/home/noctalia/settings/notifications/payday-2-new-objective-sound-effect.mp3";
       normalSoundFile = "/home/${username}/garandos/modules/home/noctalia/settings/notifications/payday-2-new-objective-sound-effect.mp3";