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/dom-crawler/Field/TextareaFormField.php

@@ -0,0 +1,39 @@
+<?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\DomCrawler\Field;
+
+/**
+ * TextareaFormField represents a textarea form field (an HTML textarea tag).
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class TextareaFormField extends FormField
+{
+    /**
+     * Initializes the form field.
+     *
+     * @return void
+     *
+     * @throws \LogicException When node type is incorrect
+     */
+    protected function initialize()
+    {
+        if ('textarea' !== $this->node->nodeName) {
+            throw new \LogicException(\sprintf('A TextareaFormField can only be created from a textarea tag (%s given).', $this->node->nodeName));
+        }
+
+        $this->value = '';
+        foreach ($this->node->childNodes as $node) {
+            $this->value .= $node->wholeText;
+        }
+    }
+}