Barcode scanning & inventory correction fixes

This release includes two improvements:

• POS barcode scanning:
  • USB scanner input no longer blocks manual typing.
  • Reliable barcode scanning regardless of keyboard layout (e.g. AZERTY, QWERTY).
• Inventory & adjustment corrections:
  • Inventory and adjustment movements are now included when calculating available quantity (stock impact on delivery notes, sales invoices, POS, etc.).
  • Correction rows inherit the product unit cost at the date of the movement in valuation.