Fix export button functionality in deployment packages

- Fix chat history storage in store_and_generate_response function
- Properly convert Gradio tuple format to dictionary format for export
- Eliminate duplicate history entries in exported conversations
- Ensure export button works correctly in generated spaces

app.py

@@ -578,13 +578,19 @@ def store_and_generate_response(message, history):
     \"\"\"Wrapper function that stores history and generates response\"\"\"
     global chat_history_store
     
-    # Store the updated history
-    chat_history_store = history.copy() if history else []
-    
     # Generate response using the protected function
     response = protected_generate_response(message, history)
     
-    # Update stored history with the new exchange
+    # Convert current history to the format we need for export
+    # history comes in as [["user1", "bot1"], ["user2", "bot2"], ...]
+    chat_history_store = []
+    if history:
+        for exchange in history:
+            if isinstance(exchange, (list, tuple)) and len(exchange) >= 2:
+                chat_history_store.append({{"role": "user", "content": exchange[0]}})
+                chat_history_store.append({{"role": "assistant", "content": exchange[1]}})
+    
+    # Add the current exchange
     chat_history_store.append({{"role": "user", "content": message}})
     chat_history_store.append({{"role": "assistant", "content": response}})