Build, enhance, audit, or migrate a React / Next.js web app with Stream (Chat, Video, Feeds, Moderation) - the default for all web React work. Scaffold Next.js + Tailwind + Shadcn + Stream React SDKs end-to-end with Steps 0-7. Add Chat/Video/Feeds/Moderation to an existing React project (enhance). Audit an existing Stream Video integration against best practices. Migrate/upgrade an SDK version (e.g. v13 -> v14). Migrate an existing Sendbird (@sendbird/chat, @sendbird/uikit-react) app to Stream Chat React. Triggers on 'build me a ... app', 'scaffold', 'create a new ...', 'add Chat to this app', 'integrate Video', 'drop Feeds into ...', 'upgrade'/'migrate'/'bump ... version', 'migrate from Sendbird', 'replace Sendbird with Stream', and React / Next.js tokens: stream-chat-react, @stream-io/video-react-sdk, @stream-io/feeds-react-sdk, useCreateChatClient, useCreateFeedsClient, StreamVideo, Channel, MessageList. Covers livestreaming, video conferencing, team messaging, direct messaging, social feed. Web React only - not React Native (use stream-react-native).