build(composer): add ext-fileinfo to composer dependencies

src/Objects/DirContent.php

@@ -14,6 +14,7 @@ readonly class DirContent
         private string $type,
         private string $path,
         private string $content,
+        private string $mimeType,
     ) {
     }
 
@@ -24,7 +25,8 @@ readonly class DirContent
             $fileInfo->getSize() ?? 0,
             $fileInfo->getType() ?? 'N/A',
             $fileInfo->getPath(),
-            $content
+            $content,
+            mime_content_type($fileInfo->getFilename()),
         );
     }
 
@@ -57,6 +59,11 @@ readonly class DirContent
         return $this->content;
     }
 
+    public function getMimeType(): string
+    {
+        return $this->mimeType;
+    }
+
     private function getHumanReadableSize(): string
     {
         $bytes = $this->size;