Browse and clean up the media library through the API

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/Http/Resources/MediaResource.php

@@ -19,6 +19,7 @@ class MediaResource extends JsonResource
     public function toArray(Request $request): array
     {
         return [
+            'id' => $this->id,
             // What a record stores — `featured_image` on a page — and so the one
             // field a caller has to keep.
             'path' => $this->path,
@@ -30,6 +31,13 @@ class MediaResource extends JsonResource
             // False until the queue has derived the smaller versions and the
             // placeholder. The image serves either way.
             'processed' => $this->isProcessed(),
+            'error' => $this->error,
+            // Only in the library, where it decides whether a file may go.
+            'referenced' => $this->when(
+                array_key_exists('referenced', $this->resource->getAttributes()),
+                fn () => (bool) $this->resource->getAttribute('referenced'),
+            ),
+            'created_at' => $this->created_at?->toIso8601String(),
         ];
     }
 }