jessesquires/JSQMessagesViewController ? reverse-engineered prompt

Build me an iOS messaging screen component that feels like the old iMessage style chat UI. I want a reusable view controller that shows a conversation with incoming and outgoing bubbles, avatars, timestamps, and a message input bar at the bottom. It should be easy to customize the colors, fonts, bubble shapes, and layouts, and it should scroll smoothly as new messages are added. Please include a small demo app so I can see it working, plus enough sample data to show different message types and edge cases. If there are any setup details or current best practices I should know, look up current docs online if you need to. Also add basic tests where it makes sense and keep the code clean and easy to extend.