feat(gui): add wayne's GUI Home Manager config matching the nixos user

Adds nextcloud-client, chromium, git, vim, claude-code, fish, sops,
the Nextcloud tray service, SOPS_AGE_KEY_FILE, and Proxmox/PBS desktop
shortcuts to wayne's HM config on GUI hosts. Uses lib.mkDefault on the
EDITOR setting in ipa/client.nix so the GUI layer can override to vim.

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

modules/ipa/client.nix

@@ -202,7 +202,7 @@ lib.mkIf enabled {
       homeDirectory = lib.mkForce "/home/${vars.ipaUser}";
       stateVersion = "26.05";
       packages = with pkgs; [ tmux sshfs ];
-      sessionVariables.EDITOR = "nano";
+      sessionVariables.EDITOR = lib.mkDefault "nano";
     };
     programs.home-manager.enable = true;
     programs.bash.enable = true;