feat: pre-activate standalone Home Manager environment in VM and Live ISO

hosts/live-iso.nix

@@ -1,6 +1,20 @@
-{ config, pkgs, inputs, lib, ... }:
+{ config, pkgs, inputs, lib, homeActivationPackage, ... }:
 
 {
+  # Pre-activate standalone home-manager for the live environment
+  system.activationScripts.home-manager-activate = {
+    text = ''
+      USER_HOME="/home/nixos"
+      if [ ! -d "$USER_HOME" ]; then
+        mkdir -p "$USER_HOME"
+        chown nixos:users "$USER_HOME"
+      fi
+      # Run activation as the nixos user
+      ${pkgs.sudo}/bin/sudo -u nixos ${homeActivationPackage}/activate
+    '';
+    deps = [ "users" ];
+  };
+
   environment.systemPackages = with pkgs; [
     git
     gum