Redesign the shared PriorityStepper (channel manager cell + detail header)
from a value-plus-stacked-arrows control into a horizontal [−] value [＋]
segmented stepper. The value now sits centred between the buttons and opens
an inline editor in a FIXED-width slot, so click-to-type no longer "pops"
the control wider (the old absolutely-positioned overlay grew w-6 → w-14).
One `size` prop drives the two surfaces: `sm` draws its own bordered pill
for the standalone table cell; `md` drops the outer border and keeps only
the segment dividers, blending into the detail header's lozenge instead of
double-bordering it. Hold-to-repeat, negatives, and the debounced-flush
persistence hook are unchanged.
The manager priority column widens 3.5rem → 5.5rem to fit the horizontal
control under fixed table layout.
Tests: 7 new DOM tests for the stepper interaction contract.
peter
8dc4976c2c