[IMP] stock_picking_batch_custom: order detailed ops by category, product, partner

Override _order on stock.move.line with stored Char fields so the server
returns records in the correct order on initial load (default_order in the
view only applies to interactive client-side sorting, not the initial fetch).

Add product_name and partner_name stored related fields to avoid SQL JOINs
in ORDER BY. Use the same fields in the view's default_order for consistency.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

stock_picking_batch_custom/models/stock_move_line.py

@@ -8,6 +8,7 @@ from odoo import models
 
 class StockMoveLine(models.Model):
     _inherit = "stock.move.line"
+    _order = "product_categ_complete_name, product_name, partner_name, id"
 
     product_categ_id = fields.Many2one(
         comodel_name="product.category",
@@ -24,6 +25,20 @@ class StockMoveLine(models.Model):
         readonly=True,
     )
 
+    product_name = fields.Char(
+        string="Product Name",
+        related="product_id.name",
+        store=True,
+        readonly=True,
+    )
+
+    partner_name = fields.Char(
+        string="Partner Name",
+        related="picking_id.partner_id.name",
+        store=True,
+        readonly=True,
+    )
+
     product_default_code = fields.Char(
         string="Product Code",
         related="product_id.default_code",

stock_picking_batch_custom/views/stock_picking_batch_views.xml

@@ -47,7 +47,7 @@
         <field name="inherit_id" ref="stock_picking_batch.view_move_line_tree"/>
         <field name="arch" type="xml">
             <xpath expr="//list" position="attributes">
-                <attribute name="default_order">product_categ_complete_name,product_id,picking_partner_id</attribute>
+                <attribute name="default_order">product_categ_complete_name,product_name,partner_name</attribute>
                 <attribute name="class">o_batch_move_line_list</attribute>
             </xpath>
             <xpath expr="//field[@name='product_id']" position="before">