Add bar widget to pause and resume the key display

A keyboard glyph in the bar (WidgetButton, right section by default)
toggles a pause flag at $XDG_RUNTIME_DIR/omarchy-key-visualizer.paused that
the panel and every bar widget instance watch, so a click on any monitor
updates all of them. While paused the panel ignores key state and hides;
the button dims. Also exposes pause/resume/toggle over the key-visualizer IPC
target.

BarWidget.qml

@@ -0,0 +1,61 @@
+import QtQuick
+import Quickshell
+import Quickshell.Io
+import qs.Ui
+import qs.Commons
+
+// Bar toggle for the Key Visualizer: a keyboard glyph that pauses/resumes the
+// on-screen key display. Pause state is a flag file in the runtime dir
+// ($XDG_RUNTIME_DIR/omarchy-key-visualizer.paused) that the panel and every bar
+// widget instance watch, so one click updates all of them. The widget is
+// dimmed while paused.
+BarWidget {
+  id: root
+  moduleName: "felixzsh.key-visualizer"
+
+  property bool paused: false
+
+  readonly property string pausePath: {
+    var runtime = Quickshell.env("XDG_RUNTIME_DIR")
+    return (runtime && runtime.length > 0 ? runtime : "/tmp") + "/omarchy-key-visualizer.paused"
+  }
+
+  function toggle() {
+    var cmd = root.paused
+      ? "rm -f " + Util.shellQuote(root.pausePath)
+      : "printf 1 > " + Util.shellQuote(root.pausePath)
+    toggleProc.command = ["sh", "-c", cmd]
+    toggleProc.running = true
+  }
+
+  Process {
+    id: toggleProc
+  }
+
+  FileView {
+    id: pauseFlag
+    path: root.pausePath
+    watchChanges: true
+    printErrors: false
+    onLoaded: root.paused = (text() === "1")
+    onFileChanged: reload()
+  }
+
+  implicitWidth: button.implicitWidth
+  implicitHeight: button.implicitHeight
+
+  WidgetButton {
+    id: button
+    anchors.fill: parent
+    bar: root.bar
+    text: "\uF030C" // nf-md-keyboard_outline
+    fontSize: Style.font.icon
+    horizontalMargin: 6
+    active: !root.paused
+    dimmed: root.paused
+    tooltipText: root.paused
+      ? "Key Visualizer — paused (click to resume)"
+      : "Key Visualizer — click to pause"
+    onPressed: function() { root.toggle() }
+  }
+}