## Summary
- Removes `ProcessedNavigationMenuItem` type and the
`sortNavigationMenuItems` enrichment pipeline that pre-computed display
fields (label, link, icon, avatarUrl, etc.) for every navigation menu
item upfront
- Replaces with `filterAndSortNavigationMenuItems` (pure filter+sort
returning raw `NavigationMenuItem[]`) and small utility functions
(`getNavigationMenuItemLabel`, `getNavigationMenuItemComputedLink`,
`getNavigationMenuItemObjectNameSingular`) that components call on
demand
- Eliminates the redundant `itemType` field (was identical to the raw
`type` field) across ~30 consumer files
- Each type-specific renderer
(`NavigationDrawerItemForObjectMetadataItem`, `NavigationMenuItemIcon`,
link/folder components) now derives only the 1-2 display fields it
actually needs from the raw item + globally available Jotai atoms
Net result: -1199 / +1177 lines, 7 files deleted, 4 new utility files.
