Fix chat_input - must be at root level

Update UI and configuration files

Fix duplicate response bug with processed query tracker - Added last_processed_query state to track already-processed queries - Prevents race conditions in Streamlit rerun cycle causing multiple LLM calls - Reset tracker on Clear Chat

Fix duplicate message bug in chat interface - Fixed flawed deduplication logic using OR instead of AND - Added proper checks to prevent duplicate user and assistant messages - Applied same fix to error handling section

Fix: Prevent repeated answers, hide API keys securely, add option to view top-k chunks

Fix local_mode -> local_only parameter name

Modern ChatGPT-style UI redesign

Fix st.chat_input outside columns

Initial commit: RAG Chatbot for Agentic AI eBook with LangGraph, Pinecone, and Groq