fix(backoffice): stop sharing the position cookie with Smart Office

Both apps wrote a cookie named `current-position-id` but stored
different ids in it — freight the `employeePositionId`, Smart Office the
`position.id`. On a shared domain each login overwrote the other's desk
selection, and the loser silently fell back to the first position.

Freight now uses `freight-current-position-id` through a small helper
that reads the old name once, so a session live across the deploy keeps
its desk, and clears it on every write.

Also mounts the position switcher in the freight dashboard header. It
only existed under /performance-management, so on every other page a
two-desk user had no way to switch and was stuck on whatever
`useAuthUser` defaulted to. It now hides below two positions rather than
showing a one-option dropdown to the single-desk majority.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

apps/edr-freight-web/backoffice/src/record-management/components/positionSelection.tsx

@@ -18,6 +18,10 @@ import {
   TooltipTrigger,
 } from "@/shared/common/ui/tooltip";
 import { PositionName } from "../dto/delegation/delegationDto";
+import {
+  getPositionCookie,
+  setPositionCookie,
+} from "@/shared/utils/positionCookie";
 interface BasePosition {
   id: string;
   employeePositionId: string;
@@ -55,7 +59,7 @@ export const PositionSelect = () => {
     ? unFilteredUserDetails.employee.flatMap((emp) => emp?.positions ?? [])
     : [];
   const selectablePositions = allPositions ?? [];
-  const currentPositionCookie = Cookies.get("current-position-id");
+  const currentPositionCookie = getPositionCookie();
   const delegatedPositionCookie = Cookies.get("delegatedPositionId");
   const activePositionId =
     selectedPositionId || currentPositionCookie || delegatedPositionCookie;
@@ -85,15 +89,18 @@ export const PositionSelect = () => {
     // (useAuthUser already self-heals this cookie for the same reason.)
     if (
       currentPosition.employeePositionId &&
-      Cookies.get("current-position-id") !== currentPosition.employeePositionId
+      getPositionCookie() !== currentPosition.employeePositionId
     ) {
-      Cookies.set("current-position-id", currentPosition.employeePositionId);
+      setPositionCookie(currentPosition.employeePositionId);
     }
 
     applyDelegationCookie(currentPosition);
   }, [currentPosition, isLoading, selectedPositionId, setSelectedPositionId]);
 
-  if (isLoading || selectablePositions.length === 0) return null;
+  // Below two desks there is nothing to switch between. This now sits in the
+  // main freight header, so a one-option dropdown would show for every
+  // single-desk staff member.
+  if (isLoading || selectablePositions.length < 2) return null;
 
   const handleChange = (value: string) => {
     const selected = selectablePositions.find((pos) => pos.id === value);
@@ -102,7 +109,7 @@ export const PositionSelect = () => {
     // dropdown's own value is position.id, which the API does not match on.
     setSelectedPositionId(selected?.employeePositionId ?? value);
     if (selected?.employeePositionId) {
-      Cookies.set("current-position-id", selected.employeePositionId);
+      setPositionCookie(selected.employeePositionId);
     }
     applyDelegationCookie(selected);
 

apps/edr-freight-web/backoffice/src/record-management/services/api/signatureAndTeeterService.ts

@@ -12,9 +12,11 @@ import {
 } from "@/record-management/dto/userRecords/teetersAndSignatureDto";
 import Cookies from "js-cookie";
 
+import { getPositionCookie } from "@/shared/utils/positionCookie";
+
 export const withHeaders = (passPosId: boolean = false) => {
   const unitId = Cookies.get("unit-id");
-  const positionId = Cookies.get("current-position-id");
+  const positionId = getPositionCookie();
   const projectId = Cookies.get("current-project-id");
   const delegatedPositionId = Cookies.get("delegatedPositionId");
 

apps/edr-freight-web/backoffice/src/record-management/services/api/withHeaders.tsx

@@ -1,9 +1,11 @@
 import Cookies from "js-cookie";
 
+import { getPositionCookie } from "@/shared/utils/positionCookie";
+
 export const withHeaders = () => {
   const tenantKey = Cookies.get("tenant-key");
   const unitId = Cookies.get("unit-id");
-  const positionId = Cookies.get("current-position-id");
+  const positionId = getPositionCookie();
   const projectId = Cookies.get("current-project-id");
   const delegatedPositionId = Cookies.get("delegatedPositionId");
   const headers: Record<string, string> = {};