Implement selection interface for notifications
- add new command
rad-tui inbox select- single mode: operation
- return new selection output (type, operation, ids, args)
- introduce
NotificationItemthat can be used to display in list / table- follow
rad inboxcolumns - issue icon: bf; (0x29bf)
- branch icon: (0xe0a0)
- follow
- implement
NotificationBrowser(check new attribute / state pattern)