Fix history format for ChatInterface

- ChatInterface passes history as tuples [(user, bot), ...]
- Convert tuple format to dict format for tokenizer
- Fixed conversation.extend() to proper loop conversion

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

app.py

@@ -53,14 +53,16 @@ def chat_with_ceo(message, history):
     Chat function that responds like the CEO
     Args:
         message: User's current message
-        history: List of previous message dictionaries
+        history: List of previous message tuples [(user_msg, bot_msg), ...]
     """
     # Build conversation context (limit history to last 5 exchanges for speed)
     conversation = []
 
-    # Process history - in Gradio ChatInterface, history is a list of dicts
-    recent_history = history[-10:] if len(history) > 10 else history  # Last 5 exchanges (10 messages)
-    conversation.extend(recent_history)
+    # Process history - ChatInterface passes history as list of tuples
+    recent_history = history[-5:] if len(history) > 5 else history  # Last 5 exchanges
+    for user_msg, bot_msg in recent_history:
+        conversation.append({"role": "user", "content": user_msg})
+        conversation.append({"role": "assistant", "content": bot_msg})
 
     # Add current message
     conversation.append({"role": "user", "content": message})