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/Image.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\DomCrawler;
+
+/**
+ * Image represents an HTML image (an HTML img tag).
+ */
+class Image extends AbstractUriElement
+{
+    public function __construct(\DOMElement $node, ?string $currentUri = null)
+    {
+        parent::__construct($node, $currentUri, 'GET');
+    }
+
+    protected function getRawUri(): string
+    {
+        return $this->node->getAttribute('src');
+    }
+
+    /**
+     * @return void
+     */
+    protected function setNode(\DOMElement $node)
+    {
+        if ('img' !== $node->nodeName) {
+            throw new \LogicException(\sprintf('Unable to visualize a "%s" tag.', $node->nodeName));
+        }
+
+        $this->node = $node;
+    }
+}