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/auth/hooks/__tests__/useAuth.test.tsx

@@ -30,12 +30,6 @@ jest.mock('@/domain-manager/hooks/useRedirect', () => ({
   })),
 }));
 
-jest.mock('@/object-metadata/hooks/useRefreshObjectMetadataItems', () => ({
-  useRefreshObjectMetadataItems: jest.fn().mockImplementation(() => ({
-    refreshObjectMetadataItems: jest.fn(),
-  })),
-}));
-
 jest.mock('@/domain-manager/hooks/useOrigin', () => ({
   useOrigin: jest.fn().mockImplementation(() => ({
     origin: 'http://localhost',

packages/twenty-front/src/modules/auth/hooks/__tests__/useHasAccessTokenPair.test.ts

@@ -1,27 +1,27 @@
 import { act, renderHook } from '@testing-library/react';
 
-import { useIsLogged } from '@/auth/hooks/useIsLogged';
+import { useHasAccessTokenPair } from '@/auth/hooks/useHasAccessTokenPair';
 import { tokenPairState } from '@/auth/states/tokenPairState';
 import { useSetAtomState } from '@/ui/utilities/state/jotai/hooks/useSetAtomState';
 
 const renderHooks = () => {
   const { result } = renderHook(() => {
-    const isLogged = useIsLogged();
+    const hasAccessTokenPair = useHasAccessTokenPair();
     const setTokenPair = useSetAtomState(tokenPairState);
 
     return {
-      isLogged,
+      hasAccessTokenPair,
       setTokenPair,
     };
   });
   return { result };
 };
 
-describe('useIsLogged', () => {
+describe('useHasAccessTokenPair', () => {
   it('should return correct value', async () => {
     const { result } = renderHooks();
 
-    expect(result.current.isLogged).toBe(false);
+    expect(result.current.hasAccessTokenPair).toBe(false);
 
     await act(async () => {
       result.current.setTokenPair({
@@ -36,6 +36,6 @@ describe('useIsLogged', () => {
       });
     });
 
-    expect(result.current.isLogged).toBe(true);
+    expect(result.current.hasAccessTokenPair).toBe(true);
   });
 });