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/Nodes/ConfvalNode.php

@@ -0,0 +1,107 @@
+<?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\Nodes;
+
+use phpDocumentor\Guides\Nodes\CompoundNode;
+use phpDocumentor\Guides\Nodes\InlineCompoundNode;
+use phpDocumentor\Guides\Nodes\LinkTargetNode;
+use phpDocumentor\Guides\Nodes\Node;
+use phpDocumentor\Guides\Nodes\OptionalLinkTargetsNode;
+use phpDocumentor\Guides\Nodes\PrefixedLinkTargetNode;
+
+/**
+ * The confval directive configuration values.
+ *
+ * https://sphinx-toolbox.readthedocs.io/en/stable/extensions/confval.html
+ *
+ * @extends CompoundNode<Node>
+ */
+final class ConfvalNode extends CompoundNode implements LinkTargetNode, OptionalLinkTargetsNode, PrefixedLinkTargetNode
+{
+    public const LINK_TYPE = 'std:confval';
+    public const LINK_PREFIX = 'confval-';
+
+    /**
+     * @param list<Node> $value
+     * @param array<string, InlineCompoundNode>  $additionalOptions
+     */
+    public function __construct(
+        private readonly string $id,
+        private readonly string $plainContent,
+        private readonly InlineCompoundNode|null $type = null,
+        private readonly bool $required = false,
+        private readonly InlineCompoundNode|null $default = null,
+        private readonly array $additionalOptions = [],
+        array $value = [],
+        private readonly bool $noindex = false,
+    ) {
+        parent::__construct($value);
+    }
+
+    public function getPlainContent(): string
+    {
+        return $this->plainContent;
+    }
+
+    public function getLinkType(): string
+    {
+        return self::LINK_TYPE;
+    }
+
+    public function getId(): string
+    {
+        return $this->id;
+    }
+
+    public function getAnchor(): string
+    {
+        return self::LINK_PREFIX . $this->id;
+    }
+
+    public function getLinkText(): string
+    {
+        return $this->plainContent;
+    }
+
+    public function getType(): InlineCompoundNode|null
+    {
+        return $this->type;
+    }
+
+    public function isRequired(): bool
+    {
+        return $this->required;
+    }
+
+    public function getDefault(): InlineCompoundNode|null
+    {
+        return $this->default;
+    }
+
+    /** @return array<string,InlineCompoundNode> */
+    public function getAdditionalOptions(): array
+    {
+        return $this->additionalOptions;
+    }
+
+    public function getPrefix(): string
+    {
+        return self::LINK_PREFIX;
+    }
+
+    public function isNoindex(): bool
+    {
+        return $this->noindex;
+    }
+}