Add 5 widgets inspired by Noctalia: activeWindow, nightLight, keyboardLayout, lockKeys, spacer

- activeWindow: shows the focused toplevel title from Quickshell.Wayland
  ToplevelManager. Left-click activates, middle-click closes, right-click
  killactive. Hidden in vertical bars to avoid title rotation noise.
- nightLight: toggles omarchy-toggle-nightlight; status detected via
  pgrep hyprsunset. Hides when hyprsunset isn't installed.
- keyboardLayout: shows current xkb layout short code, click cycles via
  hyprctl switchxkblayout. Refreshes on Hyprland activelayout events.
- lockKeys: caps/num/scroll lock indicators read from /sys/class/leds.
  Uses plain A/1/S letters; hides each indicator when off.
- spacer: configurable blank space (size) for layout tuning.

Defaults add activeWindow to the left section and nightLight to the
right section between audioPanel and brightness.

default/quickshell/bar/widgets/spacer.qml

@@ -0,0 +1,16 @@
+import QtQuick
+
+Item {
+  id: root
+
+  property QtObject bar: null
+  property string moduleName: "spacer"
+  property var settings: ({})
+
+  readonly property bool vertical: bar ? bar.vertical : false
+  readonly property int span: settings && settings.size !== undefined ? Number(settings.size) : 12
+
+  implicitWidth: vertical ? (bar ? bar.barSize : 28) : span
+  implicitHeight: vertical ? span : (bar ? bar.barSize : 26)
+  visible: span > 0
+}