[skip ci] Update compile_once signatures for type safety

Changed the compile_once method signatures in BaseHtml and HtmlTable to use nullable JsUtils and typed mixed for the view parameter, improving type safety and PHP 8+ compatibility.

Author: jcheron

Ajax/common/html/BaseHtml.php

@@ -191,7 +191,7 @@ public function setBsComponent($bsComponent) {
 		return $this;
 	}
 
-	protected function compile_once(JsUtils $js = NULL, &$view = NULL) {
+	protected function compile_once(?JsUtils $js = NULL, mixed &$view = NULL) {
 		if (! $this->_compiled) {
 			if (isset($js)) {
 				$beforeCompile = $js->getParam("beforeCompileHtml");

Ajax/semantic/html/collections/table/HtmlTable.php

@@ -423,7 +423,7 @@ public function compile(?JsUtils $js = NULL, mixed &$view = NULL) {
 		return parent::compile($js, $view);
 	}
 
-	protected function compile_once(JsUtils $js = NULL, &$view = NULL) {
+	protected function compile_once(?JsUtils $js = NULL, mixed &$view = NULL) {
 		parent::compile_once($js, $view);
 		if ($this->propertyContains("class", "sortable")) {
 			$this->addEvent("execute", "$('#" . $this->identifier . "').tablesort().data('tablesort').sort($('th.default-sort'));");