Bundles Sharing Components Allocate On A Single Fulfillment

Two lines on the same fulfillment that resolve to the same product in the same warehouse — two bundles that share a component, or a bundle plus a standalone line of that same component — now allocate together instead of stopping with a "split these items into separate fulfillments" message. The two lines are added up, allocated against the summed quantity, and split back across the lines with each keeping its own identity, and the commit that follows decrements the location once by the combined amount rather than by whichever line wrote last.

The same aggregation now runs during the availability check when you edit items on a fulfillment, so two lines of the same product whose combined increase would exceed stock are rejected together instead of each passing a check that only saw its own share.