pi-generative-ui ports Claude-style widgets to pi

This is a sharp proof that generative UI is more of a streaming/tooling pattern than a Claude-only feature. The interesting part is not the widget demo itself, but the way it recreates the whole conversation-to-UI pipeline inside a local agent runtime.

• –The extracted design guidelines make the output feel closer to Claude’s polished conversational UI than a generic embedded webview
• –Streaming partial HTML through morphdom is the real trick here; it preserves the “UI appears as the model thinks” effect
• –macOS-only WKWebView plumbing keeps the project focused, but it also makes this more of a showcase than a universal platform
• –The repo is especially relevant for agent builders who want richer in-chat visualization without waiting for vendor support
• –Because it’s reverse-engineered, it will attract tinkerers and system builders more than teams looking for a stable long-term dependency