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/Test/Constraint/CrawlerAnySelectorTextContains.php

@@ -0,0 +1,67 @@
+<?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\Test\Constraint;
+
+use PHPUnit\Framework\Constraint\Constraint;
+use Symfony\Component\DomCrawler\Crawler;
+
+final class CrawlerAnySelectorTextContains extends Constraint
+{
+    private string $selector;
+    private string $expectedText;
+    private bool $hasNode = false;
+
+    public function __construct(string $selector, string $expectedText)
+    {
+        $this->selector = $selector;
+        $this->expectedText = $expectedText;
+    }
+
+    public function toString(): string
+    {
+        if ($this->hasNode) {
+            return \sprintf('the text of any node matching selector "%s" contains "%s"', $this->selector, $this->expectedText);
+        }
+
+        return \sprintf('the Crawler has a node matching selector "%s"', $this->selector);
+    }
+
+    protected function matches($other): bool
+    {
+        if (!$other instanceof Crawler) {
+            throw new \InvalidArgumentException(\sprintf('"%s" constraint expected an argument of type "%s", got "%s".', self::class, Crawler::class, get_debug_type($other)));
+        }
+
+        $other = $other->filter($this->selector);
+        if (!\count($other)) {
+            $this->hasNode = false;
+
+            return false;
+        }
+
+        $this->hasNode = true;
+
+        $nodes = $other->each(static fn (Crawler $node) => $node->text(null, true));
+        $matches = array_filter($nodes, fn (string $node): bool => str_contains($node, $this->expectedText));
+
+        return 0 < \count($matches);
+    }
+
+    protected function failureDescription($other): string
+    {
+        if (!$other instanceof Crawler) {
+            throw new \InvalidArgumentException(\sprintf('"%s" constraint expected an argument of type "%s", got "%s".', self::class, Crawler::class, get_debug_type($other)));
+        }
+
+        return $this->toString();
+    }
+}