refactor: Cleanup git state - commit all staged changes

Major refactoring cleanup:
- Add new controller architecture (class-controller-*.php)
- Add new settings-v2 UI (views/settings-v2/)
- Add new CSS architecture (agentic-sidebar.css, tokens)
- Add esbuild build pipeline (scripts/build.js, package.json)
- Add composer dependencies (vendor/)
- Add frontend src directory (assets/js/src/index.jsx)
- Add documentation files
- Remove old/obsolete files (class-settings.php, old CSS)

This commits all pending changes from previous refactoring efforts.

vendor/symfony/html-sanitizer/Visitor/Node/DocumentNode.php

@@ -0,0 +1,40 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HtmlSanitizer\Visitor\Node;
+
+/**
+ * @author Titouan Galopin <galopintitouan@gmail.com>
+ */
+final class DocumentNode implements NodeInterface
+{
+    private array $children = [];
+
+    public function addChild(NodeInterface $node): void
+    {
+        $this->children[] = $node;
+    }
+
+    public function getParent(): ?NodeInterface
+    {
+        return null;
+    }
+
+    public function render(): string
+    {
+        $rendered = '';
+        foreach ($this->children as $child) {
+            $rendered .= $child->render();
+        }
+
+        return $rendered;
+    }
+}