fix(toc): eliminar outline azul en focus de links

Agrega outline: none para .toc-link:focus via CSSGenerator
para remover el borde azul del browser al hacer clic.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Public/TableOfContents/Infrastructure/Ui/TableOfContentsRenderer.php

@@ -311,6 +311,11 @@ final class TableOfContentsRenderer implements RendererInterface
             'font-weight' => '600',
         ]);
 
+        // Focus - eliminar outline azul del browser en click
+        $cssRules[] = $this->cssGenerator->generate('.toc-container .toc-link:focus', [
+            'outline' => 'none',
+        ]);
+
         // Level indentation
         $cssRules[] = $this->cssGenerator->generate('.toc-container .toc-level-3 .toc-link', [
             'padding-left' => $spacing['level_three_padding_left'] ?? '1.5rem',