fix: extension must be case sensitive (#93)

Author: silasjoisten

src/Cdn/Domain/AssetInfo.php

@@ -58,6 +58,6 @@ public function __construct(Asset|Image $asset)
         $this->url = $url;
         $this->extension = \strtolower($extension);
         $this->filename = null !== $dimensions ? \sprintf('%s-%s', $dimensions, $name) : $name;
-        $this->fullFilename = \sprintf('%s.%s', $this->filename, $extension);
+        $this->fullFilename = \sprintf('%s.%s', $this->filename, $this->extension);
     }
 }

tests/Unit/Cdn/Domain/AssetInfoTest.php

@@ -161,5 +161,6 @@ public function extensionIsAlwaysLowercase(): void
         $assetInfo = new AssetInfo($asset);
 
         self::assertSame('jpg', $assetInfo->extension);
+        self::assertSame('1920x1080-image.jpg', $assetInfo->fullFilename);
     }
 }