[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/models/stock_move_line.py

@@ -41,6 +41,11 @@ class StockMoveLine(models.Model):
         digits="Product Unit of Measure",
         compute="_compute_sale_ordered_qty",
     )
+    move_demand_qty = fields.Float(
+        string="Demanded Quantity",
+        digits="Product Unit of Measure",
+        compute="_compute_move_demand_qty",
+    )
 
     @api.depends("move_id.sale_ordered_qty", "move_id.product_uom", "product_uom_id")
     def _compute_sale_ordered_qty(self):
@@ -53,6 +58,18 @@ class StockMoveLine(models.Model):
             else:
                 line.sale_ordered_qty = 0.0
 
+    @api.depends("move_id.product_uom_qty", "move_id.product_uom", "product_uom_id")
+    def _compute_move_demand_qty(self):
+        """The demand of the whole move: every line of a split move shows it."""
+        for line in self:
+            move = line.move_id
+            if move.product_uom and line.product_uom_id:
+                line.move_demand_qty = move.product_uom._compute_quantity(
+                    move.product_uom_qty, line.product_uom_id, round=False
+                )
+            else:
+                line.move_demand_qty = 0.0
+
     def write(self, vals):
         res = super().write(vals)
         if vals.get("is_collected"):