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/expression-language/Node/UnaryNode.php

@@ -0,0 +1,64 @@
+<?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\ExpressionLanguage\Node;
+
+use Symfony\Component\ExpressionLanguage\Compiler;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @internal
+ */
+class UnaryNode extends Node
+{
+    private const OPERATORS = [
+        '!' => '!',
+        'not' => '!',
+        '+' => '+',
+        '-' => '-',
+    ];
+
+    public function __construct(string $operator, Node $node)
+    {
+        parent::__construct(
+            ['node' => $node],
+            ['operator' => $operator]
+        );
+    }
+
+    public function compile(Compiler $compiler): void
+    {
+        $compiler
+            ->raw('(')
+            ->raw(self::OPERATORS[$this->attributes['operator']])
+            ->compile($this->nodes['node'])
+            ->raw(')')
+        ;
+    }
+
+    public function evaluate(array $functions, array $values): mixed
+    {
+        $value = $this->nodes['node']->evaluate($functions, $values);
+
+        return match ($this->attributes['operator']) {
+            'not',
+            '!' => !$value,
+            '-' => -$value,
+            default => $value,
+        };
+    }
+
+    public function toArray(): array
+    {
+        return ['(', $this->attributes['operator'].' ', $this->nodes['node'], ')'];
+    }
+}