[Feature] Better serial number scanning on stock transactions

[casesolved-co-uk]

Is your feature request related to a problem? Please describe.
For Purchase Receipt especially, better treatment of barcode scanning regarding part numbers, serials and batches is required.

In addition to #57898

Describe the solution you'd like
On a Purchase Receipt, when a barcode of a part number is scanned on the main page which is serialled the following should happen:

• The serial dialog pops up asking you to either scan or create serial numbers for both accepted and rejected parts at the same time
• From this scanning, the quantities (accepted, rejected) of the item row should update with the correct number. You could be accepting a partial delivery.

Existing serial dialog which has to be manually activated from the row dialog:

• If batched, another dialog should appear (possibly sequentially if both are enabled) to enable batch number entry.

Impact

• Blocks critical workflow — no viable workaround
• Significant friction — current behaviour is not only buggy, but could be hugely improved
• Nice to have — minor improvement

Environment

• ERPNext Version: 16.31.1
• Deployment: Frappe Cloud