desktop: add sway/swayfx profile (dormant) with waybar, kanshi, cliphist

New profile_desktop_sway role gated by desktop_sessions_enabled, with
SwayFX effects, Waybar bar (1:1 with Polybar layout + pulseaudio),
swayidle + swaylock-effects for locking, swayosd for OSD, cliphist for
clipboard history and kanshi for multi-monitor profiles. Emptty gains
WAYLAND_SESSIONS_PATH + wayland-sessions dir. start-sway wrapper handles
session env (dbus-run-session, gpg-agent, turnstile env). Profile stays
dormant until a host opts in via desktop_sessions_enabled.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ansible/roles/profile_desktop_sway/tasks/main.yml

@@ -0,0 +1,41 @@
+---
+- name: Ensure sway config directories exist
+  tags: [dotfiles, dotfiles:desktop, sway]
+  ansible.builtin.file:
+    path: "{{ item }}"
+    state: directory
+    owner: "{{ username }}"
+    group: "{{ user_group }}"
+    mode: "0755"
+  loop:
+    - "{{ user_home }}/.config/alacritty"
+    - "{{ user_home }}/.config/dunst"
+    - "{{ user_home }}/.config/rofi"
+    - "{{ user_home }}/.config/sway"
+    - "{{ user_home }}/.config/sway/scripts"
+    - "{{ user_home }}/.config/sway/wallpapers"
+    - "{{ user_home }}/.config/waybar"
+  when: "'sway' in (desktop_sessions_enabled | default([]))"
+
+- name: Install allowed emptty Wayland sessions
+  tags: [packages, services, emptty, sway]
+  ansible.builtin.copy:
+    src: sway.desktop
+    dest: /etc/emptty/wayland-sessions/sway.desktop
+    owner: root
+    group: root
+    mode: "0644"
+  when: "'sway' in (desktop_sessions_enabled | default([]))"
+
+- name: Copy sway desktop dotfiles
+  tags: [dotfiles, dotfiles:desktop, sway]
+  ansible.builtin.copy:
+    src: "{{ playbook_dir }}/../dotfiles/desktop/{{ item.src }}"
+    dest: "{{ user_home }}/{{ item.dest }}"
+    owner: "{{ username }}"
+    group: "{{ user_group }}"
+    mode: "{{ item.mode }}"
+  loop: "{{ desktop_sway_dotfiles | default([]) }}"
+  loop_control:
+    label: "{{ item.dest }}"
+  when: "'sway' in (desktop_sessions_enabled | default([]))"