Member Junction
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    NAV_ITEM_SETTING_PREFIX: "NavItem." = 'NavItem.'

    Prefix of the MJ: Application Settings names that add a nav item to an application.

    An Open App extends another application's top nav by installing an app-scoped setting row: ApplicationID = the application to extend, Name = NavItem.<unique key> (for example NavItem.bizapps-tasks.priorities), Value = one NavItem as JSON. The row ships in the extending app's metadata, and its teardown deletes it, so removing the app removes the item.