Enhance Sway/Noctalia integration and align desktop docs

- Add canonical usb-drive-manager plugin to Noctalia (symlink from official)
- Remove nm-applet and blueman packages from nymph Sway session
- Run udiskie without tray (backend for automount/LUKS, UI via usb-drive-manager)
- Add screenOverrides support to Noctalia bar via inventory variables
- Add host_packages_absent task to packages_void role
- Update desktop docs with full plugin list and config layering
- Add focused validation check for Sway/Noctalia bootstrap

ansible/inventory/host_vars/nymph.yml

@@ -42,3 +42,14 @@ host_sway_dotfiles:
 
 noctalia_bar_monitors:
   - DP-1
+  - eDP-1
+
+noctalia_screen_overrides:
+  - name: DP-1
+    enabled: false
+  - name: eDP-1
+    enabled: false
+
+host_packages_absent:
+  - network-manager-applet
+  - blueman