[Akeru Web App] Assistant Chat Interface

[multipletwigs]

Description Following a common chat application pattern, this issue should have the basic features of a chat interface for any generative ai application.

• Design a responsive chat window that works seamlessly on both desktop and mobile devices using shadcn/ui's example as reference.
• Include standard chat UI components such as a message input box, send button, chat history area, and scroll functionality.
• Display both user messages and assistant responses in the chat window.