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>
