Add SearchMixin

A little clunky and still missing server-side

api/js/etemplate/Styles/shoelace.ts

@@ -14,8 +14,11 @@ registerIconLibrary('default', {
 /**
  * Override some shoelace icons with EGroupware icons
  * In particular, the data: ones give errors with our CSP
+ * hacky hack to temporarily work around until CSP issue is fixed
+ *
+ * @see https://my.egroupware.org/egw/index.php?menuaction=tracker.tracker_ui.edit&tr_id=68774
  */
-const egw_icons = {'chevron-down': 'arrow_down'}
+const egw_icons = {'chevron-down': 'arrow_down', 'x': 'close'}
 registerIconLibrary("system", {
 	resolver: (name) =>
 	{