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/testing/graphqlMocks.ts

@@ -1,6 +1,6 @@
-import { getOperationName } from '~/utils/getOperationName';
 import { parse, type FieldNode } from 'graphql';
 import { graphql, http, HttpResponse, type GraphQLQuery } from 'msw';
+import { getOperationName } from '~/utils/getOperationName';
 
 import { TRACK_ANALYTICS } from '@/analytics/graphql/queries/track';
 import { FIND_MANY_OBJECT_METADATA_ITEMS } from '@/object-metadata/graphql/queries';
@@ -9,10 +9,10 @@ import { REACT_APP_SERVER_BASE_URL } from '~/config';
 import { mockedClientConfig } from '~/testing/mock-data/config';
 import { mockedNoteRecords } from '~/testing/mock-data/generated/data/notes/mock-notes-data';
 import { mockedPersonRecords } from '~/testing/mock-data/generated/data/people/mock-people-data';
+import { mockedWorkspaceMemberRecords } from '~/testing/mock-data/generated/data/workspaceMembers/mock-workspaceMembers-data';
+import { mockedCoreViews } from '~/testing/mock-data/generated/metadata/views/mock-views-data';
 import { mockedPublicWorkspaceDataBySubdomain } from '~/testing/mock-data/publicWorkspaceDataBySubdomain';
 import { mockedUserData } from '~/testing/mock-data/users';
-import { mockedCoreViews } from '~/testing/mock-data/generated/metadata/views/mock-views-data';
-import { mockedWorkspaceMemberRecords } from '~/testing/mock-data/generated/data/workspaceMembers/mock-workspaceMembers-data';
 
 import { GET_PUBLIC_WORKSPACE_DATA_BY_DOMAIN } from '@/auth/graphql/queries/getPublicWorkspaceDataByDomain';
 import { LIST_PLANS } from '@/billing/graphql/queries/listPlans';
@@ -20,22 +20,25 @@ import { GET_ROLES } from '@/settings/roles/graphql/queries/getRolesQuery';
 import { isDefined } from 'twenty-shared/utils';
 import { mockBillingPlans } from '~/testing/mock-data/billing-plans';
 import { mockedCompanyRecords } from '~/testing/mock-data/generated/data/companies/mock-companies-data';
+import { mockedTaskRecords } from '~/testing/mock-data/generated/data/tasks/mock-tasks-data';
 import { mockedStandardObjectMetadataQueryResult } from '~/testing/mock-data/generated/metadata/objects/mock-objects-metadata';
 import { mockedRoles } from '~/testing/mock-data/generated/metadata/roles/mock-roles-data';
-import { mockedTaskRecords } from '~/testing/mock-data/generated/data/tasks/mock-tasks-data';
 
+import { type Task } from '@/activities/types/Task';
+import { FIND_MINIMAL_METADATA } from '@/metadata-store/graphql/queries/findMinimalMetadata';
+import { getConnectionTypename } from '@/object-record/cache/utils/getConnectionTypename';
+import { getEdgeTypename } from '@/object-record/cache/utils/getEdgeTypename';
+import { getEmptyPageInfo } from '@/object-record/cache/utils/getEmptyPageInfo';
+import { getRecordFromRecordNode } from '@/object-record/cache/utils/getRecordFromRecordNode';
+import { mockedApiKeys } from '~/testing/mock-data/generated/metadata/api-keys/mock-api-keys-data';
+import { mockedMinimalMetadata } from '~/testing/mock-data/generated/metadata/minimal/mock-minimal-metadata';
+import { mockedNavigationMenuItems } from '~/testing/mock-data/generated/metadata/navigation-menu-items/mock-navigation-menu-items-data';
 import {
   getWorkflowMock,
   getWorkflowVersionsMock,
   workflowQueryResult,
 } from '~/testing/mock-data/workflow';
 import { oneSucceededWorkflowRunQueryResult } from '~/testing/mock-data/workflow-run';
-import { type Task } from '@/activities/types/Task';
-import { getConnectionTypename } from '@/object-record/cache/utils/getConnectionTypename';
-import { getEdgeTypename } from '@/object-record/cache/utils/getEdgeTypename';
-import { getEmptyPageInfo } from '@/object-record/cache/utils/getEmptyPageInfo';
-import { getRecordFromRecordNode } from '@/object-record/cache/utils/getRecordFromRecordNode';
-import { mockedApiKeys } from '~/testing/mock-data/generated/metadata/api-keys/mock-api-keys-data';
 
 const peopleMock = [...mockedPersonRecords];
 const companiesMock = [...mockedCompanyRecords];
@@ -172,6 +175,40 @@ export const graphqlMocks = {
         });
       },
     ),
+    metadataGraphql.query(getOperationName(FIND_MINIMAL_METADATA) ?? '', () => {
+      return HttpResponse.json({
+        data: { minimalMetadata: mockedMinimalMetadata },
+      });
+    }),
+    metadataGraphql.query('FindAllCoreViews', () => {
+      return HttpResponse.json({
+        data: { getCoreViews: mockedCoreViews },
+      });
+    }),
+    metadataGraphql.query('FindFieldsWidgetCoreViews', () => {
+      return HttpResponse.json({
+        data: {
+          getCoreViews: mockedCoreViews.filter(
+            (view) => view.type === 'FIELDS_WIDGET',
+          ),
+        },
+      });
+    }),
+    metadataGraphql.query('FindAllRecordPageLayouts', () => {
+      return HttpResponse.json({
+        data: { getPageLayouts: [] },
+      });
+    }),
+    metadataGraphql.query('FindManyLogicFunctions', () => {
+      return HttpResponse.json({
+        data: { findManyLogicFunctions: [] },
+      });
+    }),
+    metadataGraphql.query('FindManyNavigationMenuItems', () => {
+      return HttpResponse.json({
+        data: { navigationMenuItems: mockedNavigationMenuItems },
+      });
+    }),
     graphql.query('SearchPeople', () => {
       return HttpResponse.json({
         data: {