feat(nixos): install tree

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

Author: eapolinario

nixos/home/eduardo/default.nix

@@ -34,6 +34,7 @@
     nodejs_24
     ripgrep
     sqlite
+    tree
     squashfsTools
     uv
   ];