Collapsed state for Runnable endpoint component

The <RunnableEndpoint> component now supports a collapsed prop to control the initial display state. When set to true, the form section is hidden until users expand it.

Markdown
1<RunnableEndpoint endpoint="GET /api/plants/{plantId}" collapsed />

This is useful for embedding multiple endpoints on a page or reducing visual clutter while maintaining interactive API testing.

Learn more about the Runnable Endpoint component.