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/page-layout/hooks/useApplyPageLayouts.ts

@@ -1,51 +0,0 @@
-import { useMetadataStore } from '@/metadata-store/hooks/useMetadataStore';
-import { splitPageLayoutWithRelated } from '@/metadata-store/utils/splitPageLayoutWithRelated';
-import { pageLayoutCurrentLayoutsComponentState } from '@/page-layout/states/pageLayoutCurrentLayoutsComponentState';
-import { pageLayoutPersistedComponentState } from '@/page-layout/states/pageLayoutPersistedComponentState';
-import { recordPageLayoutsState } from '@/page-layout/states/recordPageLayoutsState';
-import { convertPageLayoutToTabLayouts } from '@/page-layout/utils/convertPageLayoutToTabLayouts';
-import { transformPageLayout } from '@/page-layout/utils/transformPageLayout';
-import { useStore } from 'jotai';
-import { useCallback } from 'react';
-import { type PageLayout as PageLayoutGenerated } from '~/generated-metadata/graphql';
-
-export const useApplyPageLayouts = () => {
-  const store = useStore();
-  const { updateDraft, applyChanges } = useMetadataStore();
-
-  const applyPageLayouts = useCallback(
-    (pageLayouts: PageLayoutGenerated[]) => {
-      const transformedPageLayouts = pageLayouts.map(transformPageLayout);
-
-      for (const pageLayout of transformedPageLayouts) {
-        store.set(
-          pageLayoutPersistedComponentState.atomFamily({
-            instanceId: pageLayout.id,
-          }),
-          pageLayout,
-        );
-        store.set(
-          pageLayoutCurrentLayoutsComponentState.atomFamily({
-            instanceId: pageLayout.id,
-          }),
-          convertPageLayoutToTabLayouts(pageLayout),
-        );
-      }
-
-      store.set(recordPageLayoutsState.atom, transformedPageLayouts);
-
-      const { flatPageLayouts, flatPageLayoutTabs, flatPageLayoutWidgets } =
-        splitPageLayoutWithRelated(transformedPageLayouts);
-
-      updateDraft('pageLayouts', flatPageLayouts);
-      updateDraft('pageLayoutTabs', flatPageLayoutTabs);
-      updateDraft('pageLayoutWidgets', flatPageLayoutWidgets);
-      applyChanges();
-    },
-    [store, updateDraft, applyChanges],
-  );
-
-  return {
-    applyPageLayouts,
-  };
-};

packages/twenty-front/src/modules/page-layout/hooks/useRefreshPageLayouts.ts

@@ -1,28 +0,0 @@
-import { useApplyPageLayouts } from '@/page-layout/hooks/useApplyPageLayouts';
-import { useCallback } from 'react';
-import { isDefined } from 'twenty-shared/utils';
-import { useApolloClient } from '@apollo/client/react';
-import { FindAllPageLayoutsDocument } from '~/generated-metadata/graphql';
-
-export const useRefreshPageLayouts = () => {
-  const client = useApolloClient();
-
-  const { applyPageLayouts } = useApplyPageLayouts();
-
-  const refreshPageLayouts = useCallback(async () => {
-    const result = await client.query({
-      query: FindAllPageLayoutsDocument,
-      fetchPolicy: 'network-only',
-    });
-
-    if (!isDefined(result.data?.getPageLayouts)) {
-      return;
-    }
-
-    applyPageLayouts(result.data.getPageLayouts);
-  }, [client, applyPageLayouts]);
-
-  return {
-    refreshPageLayouts,
-  };
-};

packages/twenty-front/src/modules/page-layout/hooks/useSaveFieldsWidgetGroups.ts

@@ -6,7 +6,6 @@ import { fieldsWidgetGroupsPersistedComponentState } from '@/page-layout/states/
 import { fieldsWidgetUngroupedFieldsDraftComponentState } from '@/page-layout/states/fieldsWidgetUngroupedFieldsDraftComponentState';
 import { fieldsWidgetUngroupedFieldsPersistedComponentState } from '@/page-layout/states/fieldsWidgetUngroupedFieldsPersistedComponentState';
 import { useAtomComponentStateCallbackState } from '@/ui/utilities/state/jotai/hooks/useAtomComponentStateCallbackState';
-import { useRefreshAllCoreViews } from '@/views/hooks/useRefreshAllCoreViews';
 import { useMutation } from '@apollo/client/react';
 import { useStore } from 'jotai';
 import { useCallback } from 'react';
@@ -82,8 +81,6 @@ export const useSaveFieldsWidgetGroups = ({
     { input: UpsertFieldsWidgetInput }
   >(UPSERT_FIELDS_WIDGET);
 
-  const { refreshAllCoreViews } = useRefreshAllCoreViews();
-
   const store = useStore();
 
   const saveFieldsWidgetGroups = useCallback(async () => {
@@ -165,8 +162,6 @@ export const useSaveFieldsWidgetGroups = ({
     );
     store.set(fieldsWidgetEditorModePersistedState, allEditorModes);
 
-    await refreshAllCoreViews();
-
     return { status: 'successful' as const };
   }, [
     fieldsWidgetGroupsDraftState,
@@ -176,7 +171,6 @@ export const useSaveFieldsWidgetGroups = ({
     fieldsWidgetEditorModeDraftState,
     fieldsWidgetEditorModePersistedState,
     upsertFieldsWidgetMutation,
-    refreshAllCoreViews,
     store,
   ]);