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/http-client/TraceableHttpClient.php

@@ -0,0 +1,102 @@
+<?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\HttpClient;
+
+use Symfony\Component\HttpClient\Response\ResponseStream;
+use Symfony\Component\HttpClient\Response\TraceableResponse;
+use Symfony\Component\Stopwatch\Stopwatch;
+use Symfony\Contracts\HttpClient\HttpClientInterface;
+use Symfony\Contracts\HttpClient\ResponseInterface;
+use Symfony\Contracts\HttpClient\ResponseStreamInterface;
+use Symfony\Contracts\Service\ResetInterface;
+
+/**
+ * @author Jérémy Romey <jeremy@free-agent.fr>
+ */
+final class TraceableHttpClient implements HttpClientInterface, ResetInterface
+{
+    private \ArrayObject $tracedRequests;
+
+    public function __construct(
+        private HttpClientInterface $client,
+        private ?Stopwatch $stopwatch = null,
+        private ?\Closure $disabled = null,
+    ) {
+        $this->tracedRequests = new \ArrayObject();
+    }
+
+    public function request(string $method, string $url, array $options = []): ResponseInterface
+    {
+        if ($this->disabled?->__invoke()) {
+            return new TraceableResponse($this->client, $this->client->request($method, $url, $options));
+        }
+
+        $content = null;
+        $traceInfo = [];
+        $tracedRequest = [
+            'method' => $method,
+            'url' => $url,
+            'options' => $options,
+            'info' => &$traceInfo,
+            'content' => &$content,
+        ];
+        $onProgress = $options['on_progress'] ?? null;
+
+        if (false === ($options['extra']['trace_content'] ?? true)) {
+            unset($content);
+            $content = false;
+            unset($tracedRequest['options']['body'], $tracedRequest['options']['json']);
+        }
+        $this->tracedRequests[] = $tracedRequest;
+
+        $options['on_progress'] = static function (int $dlNow, int $dlSize, array $info) use (&$traceInfo, $onProgress) {
+            $traceInfo = $info;
+
+            if (null !== $onProgress) {
+                $onProgress($dlNow, $dlSize, $info);
+            }
+        };
+
+        return new TraceableResponse($this->client, $this->client->request($method, $url, $options), $content, $this->stopwatch?->start("$method $url", 'http_client'));
+    }
+
+    public function stream(ResponseInterface|iterable $responses, ?float $timeout = null): ResponseStreamInterface
+    {
+        if ($responses instanceof TraceableResponse) {
+            $responses = [$responses];
+        }
+
+        return new ResponseStream(TraceableResponse::stream($this->client, $responses, $timeout));
+    }
+
+    public function getTracedRequests(): array
+    {
+        return $this->tracedRequests->getArrayCopy();
+    }
+
+    public function reset(): void
+    {
+        if ($this->client instanceof ResetInterface) {
+            $this->client->reset();
+        }
+
+        $this->tracedRequests->exchangeArray([]);
+    }
+
+    public function withOptions(array $options): static
+    {
+        $clone = clone $this;
+        $clone->client = $this->client->withOptions($options);
+
+        return $clone;
+    }
+}