Manage Daily video call state in Angular (Part 2)

The `app-daily-container` component is the parent component for the video call feature in this Angular app. It includes the `join-form` and `app-call` components, which are rendered conditionally based on whether a Daily room URL has been set. The `app-daily-container` shares form input values with the child components using output properties, while also managing the state of the video call by tracking participant information in its `participants` object. When a remote participant joins or leaves the call, the `app-call` component updates its internal state and emits events to notify the parent container. The app also handles case where local participant leaves, resetting the UI by unmounting the `app-call` component and emitting `callEnded()` event.