Shopfloor feed resolves employee names live when none is stored

Photos already resolved through the directory at read time, but names
only came from the stored employeename column - empty after a
shopdb-only import, so recertification/recognition cards showed bare
SSOs. New resolve_employee_display_name in the employees plugin
(mode-aware: self-hosted table or external HR) backs a fallback in
both the single-card and split-per-employee paths; stored names still
win when present.

tests/test_plugins/test_shopfloor_feed.py

@@ -70,3 +70,32 @@ def test_single_employee_recognition_stays_single_card(client, db):
     current = resp.get_json()['data']['current']
     assert len(current) == 1
     assert current[0]['employeesso'] == '111'
+
+
+def test_shopfloor_names_resolve_live_when_not_stored(client, app, db):
+    """A notification imported without employeename shows the directory name,
+    not the bare SSO - single and split-per-employee paths both."""
+    from plugins.employees.models import DirectoryEmployee
+    from plugins.notifications.models import Notification, NotificationType
+    from shopdb.core.models import Setting
+
+    with app.app_context():
+        Setting.set('employee_directory_mode', 'selfhosted',
+                    valuetype='string', category='employees')
+        db.session.add(DirectoryEmployee(
+            sso=502000777, firstname='Recert', lastname='Person'))
+        ntype = NotificationType(typename='Recertification',
+                                 typecolor='recertification',
+                                 splitperemployee=True)
+        db.session.add(ntype)
+        db.session.flush()
+        db.session.add(Notification(
+            notificationtypeid=ntype.notificationtypeid,
+            notification='Recert due', isshopfloor=True,
+            employeesso='502000777', employeename=None))
+        db.session.commit()
+
+    feed = client.get('/api/notifications/shopfloor').get_json()['data']
+    cards = feed['current'] + feed['upcoming']
+    card = next(c for c in cards if c['notification'] == 'Recert due')
+    assert card['employeename'] == 'Recert Person'