Add sendEvent samples for Jetpack Compose apps

### Task description

Provide test app and update docs on using Edge.sendEvent API for path / view changes in pure Jetpack Compose apps.
Update Edge kotlin-app: the app should have multiple screens and should be implemented with Compose Screens and Navigation.

### Additional implementation details or code snippet(s)

_No response_

Start in the Edge kotlin-app and review how its sample apps are structured. Build the requested pure Jetpack Compose screens with Navigation to demonstrate Edge.sendEvent for path and view changes, then update the related documentation. Done means the multi-screen sample and its usage guidance are both present.

Written by the indexing model from the issue text.