Let the slider controls take their colours from the slider in 1.11.3

Dots, arrows, counter and button background are style properties of the
slider ("Slider-Steuerung"), written as custom properties onto the slider and
onto the control bar the script places after it, so the script-free markers
and the scripted controls share the same colours.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

tests/CmsTest.php

@@ -2257,6 +2257,20 @@ final class CmsTest extends TestCase
         $this->partials->save($header['id'], $document, (int) $header['version'] + 1);
     }
 
+    public function testSliderControlsTakeTheirColoursFromTheSliderStyle(): void
+    {
+        $document = self::styledDocument();
+        $document['schemaVersion'] = 22;
+        $document['blocks'][0]['children'][] = ['id' => 'hero-slider', 'type' => 'slider', 'props' => ['autoplay' => 0, 'dots' => true, 'snap' => true, 'desktopVisible' => 1, 'tabletVisible' => 1, 'mobileVisible' => 1], 'style' => ['desktop' => ['sliderDotColor' => '#ffffff', 'sliderControlColor' => '@mint', 'sliderControlBackground' => '#00000066']], 'children' => [
+            ['id' => 'slide-1', 'type' => 'column', 'children' => [['id' => 'slide-1-text', 'type' => 'text', 'props' => ['text' => 'Eins']]]],
+            ['id' => 'slide-2', 'type' => 'column', 'children' => [['id' => 'slide-2-text', 'type' => 'text', 'props' => ['text' => 'Zwei']]]],
+        ]];
+        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', $document, 0), 1);
+        $html = $this->request('/')->getContent();
+        // On the slider for the script-free markers, on the control bar the script adds after it.
+        self::assertStringContainsString('#hero-slider,#hero-slider + .slider-controls{--slider-dot:#ffffff;--slider-ink:var(--k-mint);--slider-bg:#00000066}', $html);
+    }
+
     public function testInlineStylesheetIsAllowedByItsOwnHashAndNothingElse(): void
     {
         $this->pages->publish('page-1', $this->pages->saveDraft('page-1', self::styledDocument(), 0), 1);