fix(mar): disable KDE theming and configure Zen browser profile

Disable stylix KDE target for mar user since mar uses GNOME desktop,
not KDE/Plasma. This prevents unnecessary KDE theming packages from
being installed.

Also configure Zen browser profile name for stylix theming to silence
the warning:
  stylix: zen-browser: 'config.stylix.targets.zen-browser.profileNames'
  is not set.

This reduces package bloat and removes configuration warnings.

Author: arunoruto

homes/mar/default.nix

@@ -7,5 +7,11 @@
       nushell.enable = true;
       zsh.enable = true;
     };
+
+    # Disable KDE/Plasma theming (mar uses GNOME)
+    stylix.targets.kde.enable = false;
+
+    # Configure Zen browser profile for stylix theming
+    stylix.targets.zen-browser.profileNames = [ "default" ];
   };
 }