Fix Display panel display toggle using rejected hyprctl keyword

Under the Lua config system, 'hyprctl keyword monitor ...' is rejected
("keyword can't work with non-legacy parsers") yet still exits 0, so the
panel's enable/disable row silently did nothing. Use the hl.monitor eval
API instead, as omarchy-hyprland-monitor-scaling already does.

The re-enable must pass disabled = false explicitly: hl.monitor rules
merge, so a disabled = true already in config (e.g. the
internal-monitor-disable toggle file) otherwise survives and the
re-enable no-ops.

shell/plugins/panels/monitor/Panel.qml

@@ -300,7 +300,13 @@ Panel {
     if (!name) return
     if (enabled && root.enabledDisplayCount <= 1) return
 
-    actionProc.command = ["hyprctl", "keyword", "monitor", name + (enabled ? ",disable" : ",preferred,auto,auto")]
+    // hyprctl keyword is rejected under the Lua config ("non-legacy parsers"),
+    // so drive the monitor through the hl.monitor eval API instead. Connector
+    // names come from hyprctl itself and match ^[A-Za-z0-9._-]+$.
+    var expr = enabled
+      ? 'hl.monitor({ output = "' + name + '", disabled = true })'
+      : 'hl.monitor({ output = "' + name + '", disabled = false, mode = "preferred", position = "auto", scale = "auto" })'
+    actionProc.command = ["hyprctl", "eval", expr]
     if (!actionProc.running) actionProc.running = true
   }