Alert inputs

On the notification screen, input fields should only become visible only after the user pressed `[add]` button. In the absence of existing alerts, only the [add] button should be displayed, without the input group.

Start at the notification screen implementation in the Kotlin Android app and inspect how alert inputs are initially rendered and shown after the [add] button is pressed. No file or test is named in the issue; verify the screen with and without existing alerts, and consider the work done when only the button appears initially and the input group appears after adding an alert.

Written by the indexing model from the issue text.