Add NelmioSecurityBundle and minor code improvements

Included NelmioSecurityBundle in composer dependencies to enhance security features. Simplified import management in PwaRuntime and improved code readability in PwaDevServerSubscriber by adjusting line formatting. These changes aim to improve maintainability and clarity.

composer.json

@@ -53,6 +53,7 @@
         "ergebnis/phpunit-slow-test-detector": "^2.14",
         "infection/infection": "^0.28|^0.29",
         "matthiasnoback/symfony-config-test": "^5.1",
+        "nelmio/security-bundle": "^3.0",
         "php-parallel-lint/php-parallel-lint": "^1.4",
         "phpstan/extension-installer": "^1.1",
         "phpstan/phpdoc-parser": "^1.28|^2.0",

src/Subscriber/PwaDevServerSubscriber.php

@@ -57,7 +57,8 @@ public function onKernelRequest(RequestEvent $event): void
 
     public function onKernelResponse(ResponseEvent $event): void
     {
-        $headers = $event->getResponse()->headers;
+        $headers = $event->getResponse()
+            ->headers;
         if ($headers->has('X-Pwa-Dev')) {
             $event->stopPropagation();
         }

src/Twig/PwaRuntime.php

@@ -14,6 +14,7 @@
 use Symfony\Component\AssetMapper\MappedAsset;
 use Symfony\Component\DependencyInjection\Attribute\Autowire;
 use Symfony\Component\Mime\MimeTypes;
+use function array_key_exists;
 use function sprintf;
 use const ENT_COMPAT;
 use const ENT_SUBSTITUTE;