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/DecoratorTrait.php

@@ -0,0 +1,57 @@
+<?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\Contracts\HttpClient\HttpClientInterface;
+use Symfony\Contracts\HttpClient\ResponseInterface;
+use Symfony\Contracts\HttpClient\ResponseStreamInterface;
+use Symfony\Contracts\Service\ResetInterface;
+
+/**
+ * Eases with writing decorators.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+trait DecoratorTrait
+{
+    private HttpClientInterface $client;
+
+    public function __construct(?HttpClientInterface $client = null)
+    {
+        $this->client = $client ?? HttpClient::create();
+    }
+
+    public function request(string $method, string $url, array $options = []): ResponseInterface
+    {
+        return $this->client->request($method, $url, $options);
+    }
+
+    public function stream(ResponseInterface|iterable $responses, ?float $timeout = null): ResponseStreamInterface
+    {
+        return $this->client->stream($responses, $timeout);
+    }
+
+    public function withOptions(array $options): static
+    {
+        $clone = clone $this;
+        $clone->client = $this->client->withOptions($options);
+
+        return $clone;
+    }
+
+    public function reset(): void
+    {
+        if ($this->client instanceof ResetInterface) {
+            $this->client->reset();
+        }
+    }
+}