The cassettes tab no longer has editable count fields, because there is
no longer an endpoint that would accept them. The bays render read-only
from the machine's own report, and a Record-operation dialog captures
what the operator did: a refill in notes added, an empty, a recount, a
denomination change.
This removes the failure the tab used to invite. A form loaded before a
dispense held a count that was already wrong, and publishing it
overwrote the dispense with no error on either side. Recording a delta
instead means a dispense that happened while the dialog was open is kept
rather than discarded, and a recount is now an explicit act — what an
operator opening a bay and counting actually does — rather than being
indistinguishable from a stale form.
A recent-operations list shows each one as Applied or Pending from
acked_at, which is the machine echoing the id back. Pending needs no
retry button: every publish carries the recent window, so an operation
that missed its own publish keeps being re-offered until it lands, and
saying so in the panel is more useful than a button that would do
nothing new.
The counts-uncertain banner tells the operator when the machine cannot
vouch for its own numbers and asks for the recount that clears it. The
machine row is re-read on every cassette refresh, since that flag is set
by the consumer while the dialog is open.
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