Each notification has a `timestamp` property (stored in RichNotificationData) that defaults to the time at which the notification was created, but can be changed to a developer-provided value as well. It is displayed in the header of each displayed notification toast.

Expected:
Notifications that have been available for 5 minutes should say "5m", aligning with Android.

Actual:
Notification that have been available for 5 minutes say "now".

We should figure out a way to automatically update display of this time whenever it's relevant.
 

Each notification has a `timestamp` property (stored in RichNotificationData) that defaults to the time at which the notification was created, but can be changed to a developer-provided value as well. It is displayed in the header of each displayed notification toast.

Expected:
Notifications that have been available for 5 minutes should say "5m", aligning with Android.

Actual:
Notifications that have been available for 5 minutes continue to say "now".

We should figure out a way to automatically update display of this time whenever it's relevant.