[FIX] #43964 UI: mark Listing\Workflow current step for assistive technologies. (ILIAS-eLearning#11145)

* Fixes https://mantis.ilias.de/view.php?id=43964
* Add `aria-current="step"` to the list element, which carries the step semantically.

Author: lukas-heinrich

components/ILIAS/UI/src/Implementation/Component/Listing/Workflow/Renderer.php

@@ -69,6 +69,7 @@ protected function render_linear(Linear $component, RendererInterface $default_r
 
             if ($index === $component->getActive()) {
                 $tpl->touchBlock('active');
+                $tpl->touchBlock('active_aria');
                 $component = $component->withAdditionalOnLoadCode(
                     fn($id) => "
                         window.requestAnimationFrame(() => {

components/ILIAS/UI/src/templates/default/Listing/tpl.linear.html

@@ -17,7 +17,7 @@ <h3 class="il-workflow-title">{TITLE}</h3>
 			<!-- BEGIN status_inprogress --> in-progress<!-- END status_inprogress -->
 			<!-- BEGIN status_completed_successfully --> completed-successfully<!-- END status_completed_successfully -->
 			<!-- BEGIN status_completed_unsuccessfully --> completed-unsuccessfully<!-- END status_completed_unsuccessfully -->
-		">
+		" <!-- BEGIN active_aria -->aria-current="step"<!-- END active_aria -->>
 
 			<div class="text">
 				<span class="il-workflow-step-label">{LABEL}</span>

components/ILIAS/UI/tests/Component/Listing/Workflow/LinearWorkflowTest.php

@@ -110,7 +110,7 @@ public function testLinearWorkflowRendering(): void
                             <span class="il-workflow-step-description"></span>
                         </div>
                     </li>
-                    <li class="il-workflow-step last active not-started">
+                    <li class="il-workflow-step last active not-started" aria-current="step">
                         <div class="text">
                             <span class="il-workflow-step-label"></span>
                             <span class="il-workflow-step-description"></span>