Escape the output name in the Display panel's hl.monitor eval

Hyprland lets a headless output take any name (`hyprctl output create headless <name>`), so a name with a quote broke out of the Lua string and the toggle failed for that output. Escape backslashes and quotes instead of asserting a character set the names do not actually follow.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Codex Medium <noreply@openai.com>

shell/plugins/panels/monitor/Panel.qml

@@ -301,11 +301,11 @@ Panel {
     if (enabled && root.enabledDisplayCount <= 1) return
 
     // 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._-]+$.
+    // so drive the monitor through the hl.monitor eval API instead.
+    var output = '"' + name.replace(/[\\"]/g, "\\$&") + '"'
     var expr = enabled
-      ? 'hl.monitor({ output = "' + name + '", disabled = true })'
-      : 'hl.monitor({ output = "' + name + '", disabled = false, mode = "preferred", position = "auto", scale = "auto" })'
+      ? 'hl.monitor({ output = ' + output + ', disabled = true })'
+      : 'hl.monitor({ output = ' + output + ', disabled = false, mode = "preferred", position = "auto", scale = "auto" })'
     actionProc.command = ["hyprctl", "eval", expr]
     if (!actionProc.running) actionProc.running = true
   }