AI Chat Interface

Shared Prompt

Create a polished AI chat interface similar to ChatGPT. Include: a sidebar with conversation history, a main chat area with message bubbles (user on right, assistant on left), a text input with send button at the bottom, markdown rendering in assistant messages with code blocks, typing indicator animation, and a model selector dropdown. Use the Gumroad design system with cream background, black borders, pill-shaped buttons. No shadows, no gradients.