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/inventory/group_vars/desktop.yml

@@ -156,6 +156,32 @@ desktop_i3_dotfiles:
     dest: .xinitrc
     mode: "0644"
 
+desktop_sway_dotfiles:
+  - name: sway config
+    src: .config/sway/
+    dest: .config/sway/
+    mode: preserve
+  - name: Sway session launcher
+    src: .local/bin/start-sway
+    dest: .local/bin/start-sway
+    mode: "0755"
+  - name: dunst config
+    src: .config/dunst/
+    dest: .config/dunst/
+    mode: preserve
+  - name: rofi config
+    src: .config/rofi/
+    dest: .config/rofi/
+    mode: preserve
+  - name: waybar config
+    src: .config/waybar/
+    dest: .config/waybar/
+    mode: preserve
+  - name: alacritty config
+    src: .config/alacritty/
+    dest: .config/alacritty/
+    mode: preserve
+
 noctalia_bar_monitors:
   - DP-1