Update leaderboard display

app.py

@@ -17,7 +17,7 @@ def create_metrics_df(results):
             'Timestamp': r['timestamp'],
             'Embeddings': r['config']['embedding_model'],
             'Retriever': r['config']['retriever_type'],
-            'Top-k': r['config']['retrieval_config'].get('top_k', 'N/A')
+            'Top-K': r['config']['retrieval_config'].get('top_k', 'N/A')
         }
         
         # Add metrics