[IMP] stock_picking_batch_collect: demanded quantity on the move line lists

The move lists already show the demand, the move line ones do not: the
detailed operations of the batch and of the transfer, and the operator
(Basket Assembly) view. Adds a read-only column with the demand of the
line's move, in the unit of the line, next to the ordered quantity.

Closes #21

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

stock_picking_batch_collect/i18n/es.po

@@ -105,6 +105,7 @@ msgid "Created on"
 msgstr "Creado el"
 
 #. module: stock_picking_batch_collect
+#: model:ir.model.fields,field_description:stock_picking_batch_collect.field_stock_move_line__move_demand_qty
 #: model:ir.model.fields,field_description:stock_picking_batch_collect.field_stock_picking_batch_summary_line__qty_demanded
 msgid "Demanded Quantity"
 msgstr "Cantidad demandada"
@@ -282,3 +283,8 @@ msgid ""
 msgstr ""
 "Hay que marcar como recogidas las operaciones de %(picking)s antes de validarlo.\n"
 "Productos pendientes: %(products)s"
+
+#. module: stock_picking_batch_collect
+#: model_terms:ir.ui.view,arch_db:stock_picking_batch_collect.view_move_line_batch_operator
+msgid "Demand"
+msgstr "Demanda"