fix: refresh admin panel feature flags after toggling (#21007)

## Summary

- Add `refetchQueries` to the `updateWorkspaceFeatureFlag` mutation in
the admin workspace detail page so the toggle reflects the new value
after toggling.
- Rename `useFeatureFlagState` → `useAdminUpdateFeatureFlag` since the
hook lives under `admin-panel` and is only consumed by the admin
workspace detail page.

## Bug

In the admin panel, toggling a feature flag for a workspace other than
the admin's own workspace sent the backend mutation successfully, but
the toggle in the UI remained unchanged.

The displayed value is derived from:
```tsx
const currentWorkspaceValue =
  currentWorkspace?.id === workspaceId
    ? currentWorkspace?.featureFlags?.find((f) => f.key === flag.key)?.value
    : undefined;
const displayedValue = currentWorkspaceValue ?? flag.value;
```

When viewing a different workspace, `currentWorkspaceValue` is
`undefined` so the toggle reads `flag.value` from the
`WORKSPACE_LOOKUP_ADMIN_PANEL` query. That query was never refetched
after the mutation, so the displayed value stayed stale.

The existing optimistic Jotai update on `currentWorkspaceState` still
runs — it is needed so the rest of the app (anything consuming
`useIsFeatureEnabled`) reacts immediately when an admin toggles a flag
on their own workspace.

## Test plan

- [ ] Open the admin panel → pick a workspace that is not your own →
Feature Flags tab → toggle a flag → toggle visually flips after the
mutation completes.
- [ ] Same flow on your own workspace → toggle flips, and any UI gated
on that flag also reacts.
- [ ] If the mutation fails, the toggle reverts (existing `onError`
rollback path).

packages/twenty-front/src/modules/settings/admin-panel/hooks/useAdminUpdateFeatureFlag.ts

@@ -3,7 +3,7 @@ import { useAtomState } from '@/ui/utilities/state/jotai/hooks/useAtomState';
 import { isDefined } from 'twenty-shared/utils';
 import { type FeatureFlagKey } from '~/generated-admin/graphql';
 
-export const useFeatureFlagState = () => {
+export const useAdminUpdateFeatureFlag = () => {
   const [currentWorkspace, setCurrentWorkspace] = useAtomState(
     currentWorkspaceState,
   );

packages/twenty-front/src/pages/settings/admin-panel/SettingsAdminWorkspaceDetail.tsx

@@ -16,7 +16,7 @@ import { SettingsAdminWorkspaceContent } from '@/settings/admin-panel/components
 import { SettingsSectionSkeletonLoader } from '@/settings/components/SettingsSectionSkeletonLoader';
 import { GET_ADMIN_WORKSPACE_CHAT_THREADS } from '@/settings/admin-panel/graphql/queries/getAdminWorkspaceChatThreads';
 import { WORKSPACE_LOOKUP_ADMIN_PANEL } from '@/settings/admin-panel/graphql/queries/workspaceLookupAdminPanel';
-import { useFeatureFlagState } from '@/settings/admin-panel/hooks/useFeatureFlagState';
+import { useAdminUpdateFeatureFlag } from '@/settings/admin-panel/hooks/useAdminUpdateFeatureFlag';
 import { useHandleImpersonate } from '@/settings/admin-panel/hooks/useHandleImpersonate';
 import { SettingsPageContainer } from '@/settings/components/SettingsPageContainer';
 import { SettingsSkeletonLoader } from '@/settings/components/SettingsSkeletonLoader';
@@ -78,10 +78,13 @@ export const SettingsAdminWorkspaceDetail = () => {
   const isBillingEnabled = billing?.isBillingEnabled ?? false;
   const canManageFeatureFlags = useAtomStateValue(canManageFeatureFlagsState);
   const { enqueueErrorSnackBar } = useSnackBar();
-  const { updateFeatureFlagState } = useFeatureFlagState();
+  const { updateFeatureFlagState } = useAdminUpdateFeatureFlag();
   const { handleImpersonate, impersonatingUserId } = useHandleImpersonate();
   const [updateFeatureFlag] = useMutation(UpdateWorkspaceFeatureFlagDocument, {
     client: apolloAdminClient,
+    refetchQueries: [
+      { query: WORKSPACE_LOOKUP_ADMIN_PANEL, variables: { workspaceId } },
+    ],
   });
 
   const { data: workspaceData, loading: isLoadingWorkspace } =