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/phpdocumentor/guides-markdown/src/Markdown/Parsers/CodeBlockParser.php

@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * This file is part of phpDocumentor.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @link https://phpdoc.org
+ */
+
+namespace phpDocumentor\Guides\Markdown\Parsers;
+
+use League\CommonMark\Extension\CommonMark\Node\Block\FencedCode;
+use League\CommonMark\Extension\CommonMark\Node\Block\IndentedCode;
+use League\CommonMark\Node\Node as CommonMarkNode;
+use League\CommonMark\Node\NodeWalker;
+use League\CommonMark\Node\NodeWalkerEvent;
+use phpDocumentor\Guides\MarkupLanguageParser;
+use phpDocumentor\Guides\Nodes\CodeNode;
+
+use function assert;
+use function count;
+use function explode;
+
+/** @extends AbstractBlockParser<CodeNode> */
+final class CodeBlockParser extends AbstractBlockParser
+{
+    public function parse(MarkupLanguageParser $parser, NodeWalker $walker, CommonMarkNode $current): CodeNode
+    {
+        assert($current instanceof IndentedCode || $current instanceof FencedCode);
+        $walker->next();
+        $codeNode = new CodeNode(explode("\n", $current->getLiteral()));
+        if ($current instanceof FencedCode) {
+            $infoWords = $current->getInfoWords();
+            if (count($infoWords) !== 0 && $infoWords[0] !== '') {
+                $codeNode->setLanguage($infoWords[0]);
+            }
+        }
+
+        return $codeNode;
+    }
+
+    public function supports(NodeWalkerEvent $event): bool
+    {
+        return $event->getNode() instanceof IndentedCode || $event->getNode() instanceof FencedCode;
+    }
+}