refactor(twenty-front): reorganize NavigationMenuItem module into common/display/edit subfolders (#18691)

## Summary

- Reorganizes the `navigation-menu-item` frontend module from a flat
structure into `common/`, `display/`, and `edit/` subfolders with
type-specific subdirectories (`link/`, `folder/`, `object/`, `view/`,
`record/`)
- Every file is now in a leaf folder describing its type: `components/`,
`hooks/`, `utils/`, `types/`, or `constants/`
- Moves 14 NavigationMenuItem-related components out of
`object-metadata/` and `side-panel/pages/` into the
`navigation-menu-item` module where they belong
- Creates type-specific display utility functions (e.g.,
`getLinkNavigationMenuItemLabel`,
`getObjectNavigationMenuItemComputedLink`) to replace generic
switch-based functions
- Unifies the Favorites section drag-and-drop from `@hello-pangea/dnd`
to `@dnd-kit/react`, matching the Workspace section's DnD library
- Renames Favorites section components from `CurrentWorkspaceMember*` to
`Favorites*` for clarity
- Deletes unused `FavoritesDragDropProviderContent` and
`NavbarDragProvider`

## Test plan

- [x] `npx nx typecheck twenty-front` passes
- [x] `npx nx lint:diff-with-main twenty-front` passes (0 warnings, 0
errors)
- [x] `npx nx test twenty-front` passes (763 suites, 4467 tests)
- [ ] Verify favorites drag-and-drop still works in the UI (reorder
items, move between folders)
- [ ] Verify workspace edit mode drag-and-drop still works
- [ ] Verify "add to navigation" drag from command menu/side panel still
works

packages/twenty-front/src/modules/side-panel/components/SidePanelItemWithAddToNavigationDrag.tsx

@@ -5,9 +5,9 @@ import { isDefined } from 'twenty-shared/utils';
 import { type IconComponent } from 'twenty-ui/display';
 
 import { CommandMenuItem } from '@/command-menu/components/CommandMenuItem';
-import { AddToNavigationDragHandle } from '@/navigation-menu-item/components/AddToNavigationDragHandle';
-import { addToNavPayloadRegistryState } from '@/navigation-menu-item/states/addToNavPayloadRegistryState';
-import type { AddToNavigationDragPayload } from '@/navigation-menu-item/types/add-to-navigation-drag-payload';
+import { AddToNavigationDragHandle } from '@/navigation-menu-item/display/dnd/components/AddToNavigationDragHandle';
+import { addToNavPayloadRegistryState } from '@/navigation-menu-item/common/states/addToNavPayloadRegistryState';
+import type { AddToNavigationDragPayload } from '@/navigation-menu-item/common/types/add-to-navigation-drag-payload';
 import { useSetAtomState } from '@/ui/utilities/state/jotai/hooks/useSetAtomState';
 
 const CommandMenuItemWithAddToNavigationDragDndKit = lazy(() =>