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/hooks/useUpdateViewAggregate.ts

@@ -6,18 +6,12 @@ import { convertExtendedAggregateOperationToAggregateOperation } from '@/object-
 import { useAtomComponentStateValue } from '@/ui/utilities/state/jotai/hooks/useAtomComponentStateValue';
 import { usePerformViewAPIUpdate } from '@/views/hooks/internal/usePerformViewAPIUpdate';
 import { useCanPersistViewChanges } from '@/views/hooks/useCanPersistViewChanges';
-import { coreViewsState } from '@/views/states/coreViewState';
 import { convertCoreViewToView } from '@/views/utils/convertCoreViewToView';
 import { useCallback } from 'react';
-import {
-  isDefined,
-  upsertIntoArrayOfObjectsComparingId,
-} from 'twenty-shared/utils';
+import { isDefined } from 'twenty-shared/utils';
 import { type CoreView } from '~/generated-metadata/graphql';
-import { useStore } from 'jotai';
 
 export const useUpdateViewAggregate = () => {
-  const store = useStore();
   const { canPersistChanges } = useCanPersistViewChanges();
   const contextStoreCurrentViewId = useAtomComponentStateValue(
     contextStoreCurrentViewIdComponentState,
@@ -67,13 +61,6 @@ export const useUpdateViewAggregate = () => {
           return;
         }
 
-        store.set(coreViewsState.atom, (currentCoreViews) =>
-          upsertIntoArrayOfObjectsComparingId(
-            currentCoreViews,
-            updatedCoreView,
-          ),
-        );
-
         const updatedView = convertCoreViewToView(updatedCoreView);
 
         loadRecordIndexStates(updatedView, objectMetadataItem);
@@ -84,7 +71,6 @@ export const useUpdateViewAggregate = () => {
       contextStoreCurrentViewId,
       performViewAPIUpdate,
       loadRecordIndexStates,
-      store,
     ],
   );