Convert the new calendar into a component

The new calendar that allows users to see multiple meetings per day is not a component, instead, it is the same container with all the controls repeated across the three scheduling apps.

We should make it a component, and so reduce duplicity.

Start by locating the new calendar container and its repeated controls across the three scheduling apps. Compare those implementations and identify the shared component boundary; done means the calendar behavior and controls are provided through one reusable component without duplicated containers.

Written by the indexing model from the issue text.