The returns table renders one list holding both booking-linked and standalone
empty returns, but a booking-linked row showed the literal string Associated
in place of its reference, and nothing showed the owning company.
listEmptyReturns becomes a raw projection joining freight.bookings and
freight.companies, so each row carries bookingReference and a companyName that
falls back to the booking's company when none was typed on the return itself.
Return date was collected as a bare date input, storing every return at 00:00.
All three entry points — booking-linked, standalone and the bulk default — now
use datetime-local seeded from local time rather than UTC, and the column
renders date and time.
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