[IMP] stock_picking_batch_collect: collected checks on transfers, ordered quantity, delivery slips report

- The collected checks also apply to transfers outside a batch, opt-in per
  operation type ("Require Collected Lines"), with the batch restrictions of
  the settings. A per-product toggle in the transfer's Operations tab collects
  all its lines.
- Read-only ordered quantity from the sale line on every batch and transfer
  view, since the weighed demand overwrites it. Adds a dependency on
  sale_stock; a migration fills it in the summary of open batches.
- "Delivery Slips" report on the batch: all its delivery slips in one PDF.

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

stock_picking_batch_collect/models/stock_backorder_confirmation.py

@@ -7,17 +7,15 @@ from odoo import models
 class StockBackorderConfirmation(models.TransientModel):
     _inherit = "stock.backorder.confirmation"
 
-    def _check_batch_summary_lines(self):
-        pickings = self.env["stock.picking"].browse(
+    def _check_collected_products(self):
+        self.env["stock.picking"].browse(
             self.env.context.get("button_validate_picking_ids", [])
-        )
-        for batch in pickings.batch_id:
-            batch._check_all_products_collected(pickings)
+        )._check_collected_products()
 
     def process(self):
-        self._check_batch_summary_lines()
+        self._check_collected_products()
         return super().process()
 
     def process_cancel_backorder(self):
-        self._check_batch_summary_lines()
+        self._check_collected_products()
         return super().process_cancel_backorder()