refactor(home): move alejandra and nil to Zed extraPackages

Remove alejandra and nil from global Nix utilities and provide them
exclusively to Zed via extraPackages, keeping them off PATH.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: stackptr

home/programs/zed.nix

@@ -1,6 +1,14 @@
-{zed-nova-theme, ...}: {
+{
+  pkgs,
+  zed-nova-theme,
+  ...
+}: {
   programs.zed-editor = {
     enable = true;
+    extraPackages = [
+      pkgs.alejandra
+      pkgs.nil
+    ];
     mutableUserSettings = false;
     themes = {
       nova = builtins.fromJSON (builtins.readFile "${zed-nova-theme}/theme.json");

modules/home/utilities.nix

@@ -95,18 +95,13 @@ in {
         nix-flake = pkgs.writeShellScriptBin "nix-flake" ''
           nix "$1" ".#$2" "''${@:3}"
         '';
-      in
-        [
-          nix-flake
-          pkgs.manix
-          pkgs.nix-du
-          pkgs.nix-tree
-          pkgs.nix-your-shell
-        ]
-        ++ [
-          pkgs.alejandra
-          pkgs.nil
-        ];
+      in [
+        nix-flake
+        pkgs.manix
+        pkgs.nix-du
+        pkgs.nix-tree
+        pkgs.nix-your-shell
+      ];
 
       programs.nh.enable = true;
     })