Presentation#
The UI for the app. Responsible for everything the user sees and interacts with.
MainActivity#
The MainActivity is what gets launched when the user opens the app on his/her
smartwatch. The MainActivity typically immediately delegates to a navigation
component which then manages which screen is first loaded and shown to the
user.
Each screen fetches the data it needs (typically using a remember function)
then renders a layout containing one or more components for the user to interact with.