Fix: chat_history addition

app.py

@@ -521,7 +521,7 @@ def chat():
         uploaded_files = session.get('uploaded_files', None)
 
         # Process the query through the main orchestrator
-        result = pharma_ai.process_query(query, viva_state=viva_state, uploaded_files=uploaded_files,chathistory=chat_history)
+        result = pharma_ai.process_query(query, viva_state=viva_state, uploaded_files=uploaded_files,chat_history=chat_history)
         # If the query was successful, update the history
         if result.get('success'):
             # Add the user's query and the AI's message to the history