Adjust image positioning to ensure soccer players' faces are visible

Update `objectPosition` style in `MainContent.tsx` and `AdminDashboard.tsx` to `center top` for better image display of player faces.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 069d4324-6c40-4355-955e-c714a50de1ea
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/3df548ff-50ae-432f-9be4-25d34eccc983/069d4324-6c40-4355-955e-c714a50de1ea/jvFIdY3

client/src/pages/AdminDashboard.tsx

@@ -199,6 +199,7 @@ export default function AdminDashboard() {
                             src={outlet.imageUrl} 
                             alt={outlet.name}
                             className="w-full h-full object-cover"
+                            style={{objectPosition: 'center top'}}
                           />
                         ) : (
                           <div className="w-8 h-8 bg-gray-300 rounded-full flex items-center justify-center">