register bare views
Set default view to None and never display widget with no view
Merge pull request #6532 from SylvainCorlay/barewidgetmodels

Fix Issue #6530
Remove leftover text key from our own payload creation
Adapt msgspec v4 pager payloads to msgspec v5 format
Merge pull request #6545 from takluyver/msgspec-payloads-adapter

Adapt pager payloads from v4 to v5
Allow timeout and click callback
Add documentation to NotificationWidget methods
Add documentation to notification area
Small changes to notification widget
Add tests for notification area and widgets