Fix allow_mail_archived_partner causing system notifications to send emails

partner_hierarchical_name/models/__init__.py

@@ -0,0 +1 @@
+from . import res_partner

partner_hierarchical_name/models/res_partner.py

@@ -0,0 +1,25 @@
+from odoo import models
+
+
+class ResPartner(models.Model):
+    _inherit = "res.partner"
+
+    def name_get(self):
+        result = []
+
+        for partner in self:
+            names = []
+            current = partner
+
+            # Walk up the hierarchy
+            while current:
+                if current.name:
+                    names.append(current.name)
+                current = current.parent_id
+
+            # Reverse to show top-down (L1 / L2 / L3)
+            full_name = " / ".join(reversed(names))
+
+            result.append((partner.id, full_name))
+
+        return result