Kitchen display devices open a full-screen KDS without staff login,
with feed/stream/bump over the device token. Shared kitchen board
logic is extracted so the signed-in Kitchen page stays in sync.
Register tills, customer displays, kitchen screens, printers, scanners,
and tablets per branch. Customer displays share the branch display token
and mark online when the public screen polls; stale devices go offline
on a schedule.
isaacclad