Improve image display by prioritizing Facebook feed URLs

Update image rendering in the new post page to use `facebookFeedUrl` when available, otherwise fallback to `originalUrl`.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: ae4037a0-2a6f-4530-9bac-79b543286bda
Replit-Commit-Checkpoint-Type: intermediate_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/397bca8c-984f-43ff-841a-10897aeb8140/ae4037a0-2a6f-4530-9bac-79b543286bda/F3F3s9V

client/src/pages/new-post.tsx

@@ -75,7 +75,7 @@ function SortableMediaItem({
         data-testid={`button-select-media-${media.id}`}
       >
         <img 
-          src={media.originalUrl} 
+          src={media.facebookFeedUrl || media.originalUrl} 
           alt={media.fileName}
           className="w-full h-full object-cover"
         />
@@ -510,7 +510,7 @@ export default function NewPost() {
                                   data-testid={`button-select-media-${media.id}`}
                                 >
                                   <img 
-                                    src={media.originalUrl} 
+                                    src={media.facebookFeedUrl || media.originalUrl} 
                                     alt={media.fileName}
                                     className="w-full h-full object-cover"
                                   />