desktop widgets: sync position across screens option, clickthrough

option, grouping in settings, repositioning, new IPCs for control
fixes #1300
fixes #1301

quickshell/Common/settings/SettingsSpec.js

@@ -402,6 +402,8 @@ var SPEC = {
 
     desktopWidgetInstances: { def: [] },
 
+    desktopWidgetGroups: { def: [] },
+
     builtInPluginSettings: { def: {} }
 };