Persistent Conversation History with ChromaDB

Implement client-side persistence for conversation history using ChromaDB. When the user sends a message, store it and the agent's response in ChromaDB. When the page loads, retrieve the last N messages to pre-populate the chat. Focus on how embeddings for chat messages can be generated (e.g., using a small, locally-run embedding model via OpenVINO or a remote API call) before storing them.