chore(nix): add evil-helix package and trusted-users setting

Add pkgs.evil-helix_git to the home environment so the helix-based
editor is available for the user.

Configure nix.settings.trusted-users to include "root" and "@wheel" so
the wheel group is treated as trusted users for Nix system operations.

home/linux.nix

@@ -117,5 +117,6 @@
     inputs.noctalia.packages.${system}.default
     inputs.copetch.packages.${system}.default
     pkgs.qt6Packages.qtwebsockets
+    pkgs.evil-helix_git
   ];
 }