Update app.py

app.py

@@ -42,7 +42,7 @@ def add_diagnostics_ui(search_system):
         # Metadata validation
         with col1:
             st.subheader("📂 Metadata Validation")
-            metadata_dir = search_system.metadata_mgr.metadata_dir
+            metadata_dir = search_system.metadata_mgr.shard_dir
             if metadata_dir.exists():
                 parquet_files = list(metadata_dir.glob("*.parquet"))
                 status = len(parquet_files) > 0
@@ -187,7 +187,7 @@ def main():
 
         if st.button("🔄 Refresh System"):
             st.cache_resource.clear()
-            st.experimental_rerun()
+            st.rerun()
 
 if __name__ == "__main__":
     main()