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-restructured-text/src/RestructuredText/Directives/ConfvalDirective.php

@@ -0,0 +1,104 @@
+<?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\RestructuredText\Directives;
+
+use phpDocumentor\Guides\Nodes\CollectionNode;
+use phpDocumentor\Guides\Nodes\Node;
+use phpDocumentor\Guides\ReferenceResolvers\AnchorNormalizer;
+use phpDocumentor\Guides\RestructuredText\Nodes\ConfvalNode;
+use phpDocumentor\Guides\RestructuredText\Parser\BlockContext;
+use phpDocumentor\Guides\RestructuredText\Parser\Directive;
+use phpDocumentor\Guides\RestructuredText\Parser\InlineParser;
+use phpDocumentor\Guides\RestructuredText\Parser\Productions\Rule;
+use phpDocumentor\Guides\RestructuredText\TextRoles\GenericLinkProvider;
+use Psr\Log\LoggerInterface;
+
+use function in_array;
+use function trim;
+
+/**
+ * The confval directive configuration values.
+ *
+ * https://sphinx-toolbox.readthedocs.io/en/stable/extensions/confval.html
+ */
+final class ConfvalDirective extends SubDirective
+{
+    public const NAME = 'confval';
+
+    /** @param Rule<CollectionNode> $startingRule */
+    public function __construct(
+        protected Rule $startingRule,
+        GenericLinkProvider $genericLinkProvider,
+        private readonly AnchorNormalizer $anchorReducer,
+        private readonly InlineParser $inlineParser,
+        private readonly LoggerInterface|null $logger = null,
+    ) {
+        parent::__construct($startingRule);
+
+        $genericLinkProvider->addGenericLink(self::NAME, ConfvalNode::LINK_TYPE, ConfvalNode::LINK_PREFIX);
+    }
+
+    public function getName(): string
+    {
+        return self::NAME;
+    }
+
+    /** {@inheritDoc}
+     *
+     * @param Directive $directive
+     */
+    protected function processSub(
+        BlockContext $blockContext,
+        CollectionNode $collectionNode,
+        Directive $directive,
+    ): Node|null {
+        $id = $directive->getData();
+        if ($directive->hasOption('name')) {
+            $id = (string) $directive->getOption('name')->getValue();
+        }
+
+        $id = $this->anchorReducer->reduceAnchor($id);
+        $type = null;
+        $required = false;
+        $default = null;
+        $additionalOptions = [];
+        if (trim($directive->getData()) === '') {
+            if ($this->logger !== null) {
+                $this->logger->warning('A directive must have a title: ..  confval:: [some_title]', $blockContext->getLoggerInformation());
+            }
+        }
+
+        if ($directive->hasOption('type')) {
+            $type = $this->inlineParser->parse($directive->getOptionString('type'), $blockContext);
+        }
+
+        $required = $directive->getOptionBool('required');
+
+        if ($directive->hasOption('default')) {
+            $default = $this->inlineParser->parse($directive->getOptionString('default'), $blockContext);
+        }
+
+        $noindex = $directive->getOptionBool('noindex');
+
+        foreach ($directive->getOptions() as $option) {
+            if (in_array($option->getName(), ['type', 'required', 'default', 'noindex', 'name'], true)) {
+                continue;
+            }
+
+            $additionalOptions[$option->getName()] = $this->inlineParser->parse($option->toString(), $blockContext);
+        }
+
+        return new ConfvalNode($id, $directive->getData(), $type, $required, $default, $additionalOptions, $collectionNode->getChildren(), $noindex);
+    }
+}