Remove Sway from the playbook, keep Noctalia configs

Drop the profile_desktop_sway role (tasks, templates), all Sway
dotfiles, desktop_sway_* vars, and wayland-sessions emptty path.
Noctalia dotfiles are preserved and deployed via desktop_void_dotfiles
on Void hosts; noctalia_bar_monitors/noctalia_screen_overrides kept
as config vars. Only i3 remains as the Void desktop session.

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

ansible/roles/packages_void/tasks/main.yml

@@ -61,11 +61,6 @@
             if 'i3' in (desktop_sessions_enabled | default([]))
             else []
           )
-        + (
-            (desktop_sway_packages | default([]))
-            if 'sway' in (desktop_sessions_enabled | default([]))
-            else []
-          )
         + (host_packages | default([]))
         )
         | unique