fix(autoswitch): WorkspacesChanged output-set diff; unit paths; deploy symlinks

- niri 26.04 has no hotplug event: OutputConfigChanged is only an ACK
  (niri-ipc). Watch WorkspacesChanged, diff sorted output set, apply on
  change. Proven live: eDP-1 off/on -> 3 output-set transitions, each
  matched + applied + reloaded.
- unit: %h/.local/bin/desk-autoswitch.sh, quoted Environment, drop
  User/Group (user unit); add desk-autoswitch.sh bin symlink
- desk.sh: silence validate/load-config/notify stdout
- deploy.sh: deploy repo symlinks (find -type l), so .local/bin links land
- docs: event semantics corrected (displays diagram, log)

dotfiles/noctalia/.local/state/noctalia/settings.toml

@@ -112,8 +112,8 @@ widget_order = [
     [lockscreen_widgets.widget."lockscreen-login-box@eDP-1"]
     box_height = 196.0
     box_width = 810.0
-    cx = 960.0
-    cy = 852.5
+    cx = 960.000244140625
+    cy = 852.500244140625
     output = "eDP-1"
     placement_height = 1080.0
     placement_width = 1920.0