update flake.lock with new versions for Homebrew and other dependencies; modify manage.sh to use sudo for rebuild commands; add gnu-tar and freelens to homebrew apps; set primary user in system configuration

modules/darwin/apps/homebrew.nix

@@ -12,6 +12,7 @@
       "argoproj/homebrew-tap/kubectl-argo-rollouts"
       "gh"
       "git"
+      "gnu-tar"
       "hauler-dev/homebrew-tap/hauler"
       "helm"
       "httpie"
@@ -26,6 +27,7 @@
       "citrix-workspace"
       "cursor"
       "elgato-wave-link"
+      "freelens"
       "ghostty"
       "httpie"
       "joplin"

modules/darwin/system/system.nix

@@ -1,6 +1,8 @@
 { config, lib, ... }:
 
-{ 
+{
+  system.primaryUser = config._module.args.username;
+ 
   system.defaults.screencapture = {
     location = "~/Documents/Screenshots"; # Set default screenshot location
     # Add more screencapture settings here
@@ -22,8 +24,4 @@
   system.defaults.WindowManager.EnableStandardClickToShowDesktop = false; # Disable/Enable standard click to show desktop
   # You can add more Mac defaults here as well...
 
-  system.activationScripts.postUserActivation.text = ''
-    # Following line should allow us to avoid a logout/login cycle
-    /System/Library/PrivateFrameworks/SystemAdministration.framework/Resources/activateSettings -u
-  ''; # Activate settings after user activation
 }