feat(configurator): save a part description version on SO confirm

Each part-bearing line writes a deduped version (final order# + date) via
_fp_save_description_version, after the parent-number rename so the title
reflects the confirmed order number.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

fusion_plating/fusion_plating_configurator/models/sale_order.py

@@ -886,4 +886,19 @@ class SaleOrder(models.Model):
                     line.x_fc_job_number = Sequence.next_by_code(
                         'fp.job.number'
                     ) or False
+        # Per-part description history (spec 2026-05-29). After super() +
+        # the parent-number rename, so.name is the final order number.
+        for so in self:
+            for line in so.order_line:
+                if line.display_type:
+                    continue
+                part = (line.x_fc_part_catalog_id
+                        if 'x_fc_part_catalog_id' in line._fields else False)
+                if not part:
+                    continue
+                part._fp_save_description_version(
+                    internal_desc=line.x_fc_internal_description or '',
+                    customer_desc=line.name or '',
+                    order=so, line=line,
+                )
         return res