refactor: metadata store cleanup, SSE unification, mock metadata loading & login redirect fix (#18651)

## Summary
- **SSE unification**: Replaced 11 individual SSE effect components with
a single generic `MetadataStoreSSEEffect`
- **Metadata store cleanup**: Merged `metadataCollectionHashesState`
into `metadataStoreState` (currentCollectionHash / draftCollectionHash
per entity), moved `objectMetadataItemsSelector` to `object-metadata`
domain, converted `navigationMenuItemsState` to a derived selector
- **Naming clarity**: Renamed `isAppMetadataReadyState` →
`isMinimalMetadataReadyState`, `MetadataGater` → `MinimalMetadataGater`,
`useIsLogged` → `useHasAccessTokenPair`,
`patchMetadataStoreFromSSEEvent` now takes named object params
- **Mock metadata loading**: Added `generate-navigation-menu-items.ts`
script, rewrote `useLoadMockedMinimalMetadata` to load full
objects/fields/indexes/views/navItems from generated mock data, enabling
proper sign-in background rendering (table columns, view picker,
navigation)
- **Login/logout transitions**: `MinimalMetadataLoadEffect` manages
mocked↔real metadata transitions based on auth state,
`MainContextStoreProvider` computes context on auth pages for view
picker support
- **Login redirect fix**: `handleLoadWorkspaceAfterAuthentication` now
re-enables `isAppEffectRedirectEnabled` after `loadCurrentUser()`
completes, fixing the blocked post-login navigation
- **Dead code removal**: Deleted `useRefreshPageLayouts`,
`useApplyPageLayouts`, `useStaleMetadataEntities`,
`metadataCollectionHashesState`, and all individual SSE effects

## Test plan
- [x] Login from welcome page redirects to companies page
- [x] Logout transitions cleanly to mocked metadata on welcome page
- [x] Sign-in background shows table columns, view picker, and
navigation items
- [x] SSE events still update metadata store entries correctly
- [x] Navigation menu items persist across page refreshes
- [ ] CI: lint, typecheck, tests pass

packages/twenty-front/src/modules/views/components/UpdateViewButtonGroup.tsx

@@ -1,7 +1,6 @@
 import { styled } from '@linaria/react';
 
 import { contextStoreCurrentViewIdComponentState } from '@/context-store/states/contextStoreCurrentViewIdComponentState';
-import { useRecordIndexContextOrThrow } from '@/object-record/record-index/contexts/RecordIndexContext';
 import { Dropdown } from '@/ui/layout/dropdown/components/Dropdown';
 import { DropdownContent } from '@/ui/layout/dropdown/components/DropdownContent';
 import { DropdownMenuItemsContainer } from '@/ui/layout/dropdown/components/DropdownMenuItemsContainer';
@@ -17,7 +16,6 @@ import { useAreViewSortsDifferentFromRecordSorts } from '@/views/hooks/useAreVie
 import { useCanPersistViewChanges } from '@/views/hooks/useCanPersistViewChanges';
 import { useGetCurrentViewOnly } from '@/views/hooks/useGetCurrentViewOnly';
 import { useIsViewAnyFieldFilterDifferentFromCurrentAnyFieldFilter } from '@/views/hooks/useIsViewAnyFieldFilterDifferentFromCurrentAnyFieldFilter';
-import { useRefreshCoreViewsByObjectMetadataId } from '@/views/hooks/useRefreshCoreViewsByObjectMetadataId';
 import { useSaveCurrentViewFiltersAndSorts } from '@/views/hooks/useSaveCurrentViewFiltersAndSorts';
 import { VIEW_PICKER_DROPDOWN_ID } from '@/views/view-picker/constants/ViewPickerDropdownId';
 import { useViewPickerMode } from '@/views/view-picker/hooks/useViewPickerMode';
@@ -39,11 +37,6 @@ export const UpdateViewButtonGroup = () => {
   const { saveCurrentViewFilterAndSorts } = useSaveCurrentViewFiltersAndSorts();
   const { canPersistChanges } = useCanPersistViewChanges();
 
-  const { refreshCoreViewsByObjectMetadataId } =
-    useRefreshCoreViewsByObjectMetadataId();
-
-  const { objectMetadataItem } = useRecordIndexContextOrThrow();
-
   const { setViewPickerMode } = useViewPickerMode();
 
   const contextStoreCurrentViewId = useAtomComponentStateValue(
@@ -83,7 +76,6 @@ export const UpdateViewButtonGroup = () => {
   const handleUpdateViewClick = async () => {
     if (!canPersistChanges) return;
     await saveCurrentViewFilterAndSorts();
-    await refreshCoreViewsByObjectMetadataId(objectMetadataItem.id);
   };
 
   const { hasFiltersQueryParams } = useHasFiltersInQueryParams();