Improved Discovery Experience

Today's updates include:

1. Characters Greetings - Characters now have a greeting message that appears when you start a chat with them, based on this request.
2. Design Polish for Chat - Added a tiny iOS like tail to the messages and a gentle transition when a new message appears.
3. Redesign for Home Cards - Redesigned the home cards to show more information about the characters and their creators. this request
4. Added Markdown Render in Chat - Now you can use markdown in the chat to make your messages more expressive. this request