sendbird/delight-ai-agent ? reverse-engineered prompt

Build me a clean sample repo for integrating Delight AI Agent across web, iOS, and Android.

I want the web side to include a working React demo and a simple plain JavaScript demo that both show how to load the messenger, pass in the app and agent IDs, handle login or session state, and let a user open, close, and control the chat widget. Make the examples easy to run locally and easy to copy into a real app. Include clear setup instructions and a few screenshots or simple walkthroughs if that helps.

For iPhone and Android, create practical getting started guides and sample apps or code snippets that show the basic integration flow and where the app and agent IDs go.

Keep the tone simple and beginner friendly, since this is mostly for customer support teams and developers who just want to get the agent running fast. If you need to check current SDK or docs details, look them up online first.