Add impersonate banner (#14734)

Related to https://github.com/twentyhq/twenty/pull/14360

<img width="1511" height="468" alt="Screenshot 2025-09-26 at 12 16 46"
src="https://github.com/user-attachments/assets/33e0e0b5-1226-455d-90f2-e4fc3deef7a8"
/>

@Bonapara, let you tell me if wording and banner color are ok. This
banner is displayed when a user is impersonating an other user

packages/twenty-front/src/modules/auth/states/isImpersonatingState.ts

@@ -0,0 +1,24 @@
+import { jwtDecode } from 'jwt-decode';
+import { selector } from 'recoil';
+import { isDefined } from 'twenty-shared/utils';
+import { tokenPairState } from './tokenPairState';
+
+export const isImpersonatingState = selector<boolean>({
+  key: 'isImpersonatingState',
+  get: ({ get }) => {
+    const tokenPair = get(tokenPairState);
+
+    if (!isDefined(tokenPair?.accessOrWorkspaceAgnosticToken?.token)) {
+      return false;
+    }
+
+    try {
+      const decodedToken = jwtDecode<{ isImpersonating: boolean }>(
+        tokenPair.accessOrWorkspaceAgnosticToken.token,
+      );
+      return decodedToken?.isImpersonating ?? false;
+    } catch {
+      return false;
+    }
+  },
+});

packages/twenty-front/src/modules/information-banner/components/InformationBannerWrapper.tsx

@@ -1,13 +1,16 @@
+import { isImpersonatingState } from '@/auth/states/isImpersonatingState';
 import { InformationBannerBillingSubscriptionPaused } from '@/information-banner/components/billing/InformationBannerBillingSubscriptionPaused';
 import { InformationBannerEndTrialPeriod } from '@/information-banner/components/billing/InformationBannerEndTrialPeriod';
 import { InformationBannerFailPaymentInfo } from '@/information-banner/components/billing/InformationBannerFailPaymentInfo';
 import { InformationBannerNoBillingSubscription } from '@/information-banner/components/billing/InformationBannerNoBillingSubscription';
+import { InformationBannerIsImpersonating } from '@/information-banner/components/impersonate/InformationBannerIsImpersonating';
 import { InformationBannerReconnectAccountEmailAliases } from '@/information-banner/components/reconnect-account/InformationBannerReconnectAccountEmailAliases';
 import { InformationBannerReconnectAccountInsufficientPermissions } from '@/information-banner/components/reconnect-account/InformationBannerReconnectAccountInsufficientPermissions';
 import { useIsSomeMeteredProductCapReached } from '@/workspace/hooks/useIsSomeMeteredProductCapReached';
 import { useIsWorkspaceActivationStatusEqualsTo } from '@/workspace/hooks/useIsWorkspaceActivationStatusEqualsTo';
 import { useSubscriptionStatus } from '@/workspace/hooks/useSubscriptionStatus';
 import styled from '@emotion/styled';
+import { useRecoilValue } from 'recoil';
 import { isDefined } from 'twenty-shared/utils';
 import { WorkspaceActivationStatus } from 'twenty-shared/workspace';
 import { SubscriptionStatus } from '~/generated-metadata/graphql';
@@ -27,6 +30,7 @@ export const InformationBannerWrapper = () => {
     WorkspaceActivationStatus.SUSPENDED,
   );
   const isSomeMeteredProductCapReached = useIsSomeMeteredProductCapReached();
+  const isImpersonating = useRecoilValue(isImpersonatingState);
 
   const displayBillingSubscriptionPausedBanner =
     isWorkspaceSuspended && subscriptionStatus === SubscriptionStatus.Paused;
@@ -54,6 +58,7 @@ export const InformationBannerWrapper = () => {
       )}
       {displayFailPaymentInfoBanner && <InformationBannerFailPaymentInfo />}
       {displayEndTrialPeriodBanner && <InformationBannerEndTrialPeriod />}
+      {isImpersonating && <InformationBannerIsImpersonating />}
     </StyledInformationBannerWrapper>
   );
 };

packages/twenty-front/src/modules/information-banner/components/impersonate/InformationBannerIsImpersonating.tsx

@@ -0,0 +1,27 @@
+import { useAuth } from '@/auth/hooks/useAuth';
+import { currentWorkspaceMemberState } from '@/auth/states/currentWorkspaceMemberState';
+import { InformationBanner } from '@/information-banner/components/InformationBanner';
+import { t } from '@lingui/core/macro';
+import { useRecoilValue } from 'recoil';
+import { isDefined } from 'twenty-shared/utils';
+import { IconLogout } from 'twenty-ui/display';
+
+export const InformationBannerIsImpersonating = () => {
+  const currentWorkspaceMember = useRecoilValue(currentWorkspaceMemberState);
+  const { signOut } = useAuth();
+
+  if (!isDefined(currentWorkspaceMember)) {
+    return null;
+  }
+
+  const impersonatedUser = `${currentWorkspaceMember.name.firstName} ${currentWorkspaceMember.name.lastName} (${currentWorkspaceMember.userEmail})`;
+
+  return (
+    <InformationBanner
+      message={t`Logged in as ${impersonatedUser}`}
+      buttonTitle={t`Stop impersonating`}
+      buttonIcon={IconLogout}
+      buttonOnClick={signOut}
+    />
+  );
+};

packages/twenty-front/src/modules/settings/members/ManageMembersDropdownMenu.tsx

@@ -1,3 +1,4 @@
+import { isImpersonatingState } from '@/auth/states/isImpersonatingState';
 import { useHasPermissionFlag } from '@/settings/roles/hooks/useHasPermissionFlag';
 import { Dropdown } from '@/ui/layout/dropdown/components/Dropdown';
 import { DropdownContent } from '@/ui/layout/dropdown/components/DropdownContent';
@@ -5,6 +6,7 @@ import { DropdownMenuItemsContainer } from '@/ui/layout/dropdown/components/Drop
 import { useCloseDropdown } from '@/ui/layout/dropdown/hooks/useCloseDropdown';
 import { type WorkspaceMember } from '@/workspace-member/types/WorkspaceMember';
 import { t } from '@lingui/core/macro';
+import { useRecoilValue } from 'recoil';
 import { IconDotsVertical, IconSpy, IconTrash } from 'twenty-ui/display';
 import { LightIconButton } from 'twenty-ui/input';
 import { MenuItem } from 'twenty-ui/navigation';
@@ -24,7 +26,9 @@ export const ManageMembersDropdownMenu = ({
   onImpersonate,
 }: ManageMembersDropdownMenuProps) => {
   const { closeDropdown } = useCloseDropdown();
-  const canImpersonate = useHasPermissionFlag(PermissionFlagType.IMPERSONATE);
+  const isImpersonating = useRecoilValue(isImpersonatingState);
+  const canImpersonate =
+    useHasPermissionFlag(PermissionFlagType.IMPERSONATE) && !isImpersonating;
 
   return (
     <Dropdown