Expand and clean up Arch GNOME packages, remove alacritty from Arch

- arch_desktop_gnome_packages: add full GNOME app suite (baobab, gnome-console,
  loupe, papers, showtime, snapshot, sushi, gvfs backends, etc.), sort
  alphabetically, remove duplicates already in arch_packages_base
  (gnome-keyring, gvfs, gvfs-mtp, gvfs-smb, simple-scan)
- Remove alacritty from arch_profile_packages; move alacritty config and
  directory creation to Void-only (profile_desktop_i3 / desktop_void_dotfiles)
- Enable emacs user service via ansible.builtin.systemd (scope: user)
  instead of a manual symlink

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

ansible/inventory/group_vars/desktop.yml

@@ -35,10 +35,6 @@ desktop_common_dotfiles:
     src: .config/autostart/
     dest: .config/autostart/
     mode: preserve
-  - name: alacritty config
-    src: .config/alacritty/
-    dest: .config/alacritty/
-    mode: preserve
   - name: fastfetch config
     src: .config/fastfetch/
     dest: .config/fastfetch/