shopfloor dashboard: show site time, and align the state badge

Every time on the board was wrong, from two faults stacked.

The shopfloor feed serialised starttime/endtime with a bare isoformat(). Those
columns are stored NAIVE but hold UTC, so an untagged string is read by the
browser as LOCAL and every card shifted by the tz offset. The model's to_dict
already learned this - its _utc_iso helper documents the exact symptom, a 14:34
notification showing 18:34 - but the feed had not, so the feed now uses it too.

The dashboard then formatted with toLocaleString, i.e. the VIEWER's zone. A
board hangs on a wall in the plant: it has to read plant time whatever the
machine driving it is set to, and a kiosk with a wrong system timezone would
otherwise show wrong times to the floor with nothing to reveal it. It now
loads site_timezone and formats through formatInZone, the wall clock included -
a header disagreeing with the cards beneath it is worse than either being
wrong alone.

startsWhen was worse still: it decided TODAY/TOMORROW from browser-local
calendar days, so the wording itself could differ between the board and a
remote admin looking at the same card. That arithmetic now runs on the site's
calendar day.

Separately, the type chip carried a margin-bottom while the state chip beside
it did not. .chip-row centres each item's MARGIN box, so that margin lifted the
type chip about 4px and left "Starts Thu, Aug 13 8:00 PM" looking low. The row
already provides the spacing, so the chip's own margin is gone.

plugins/notifications/api/routes.py

@@ -11,6 +11,7 @@ from flask_jwt_extended import jwt_required
 from shopdb.api import db, success_response, error_response, paginated_response, ErrorCodes, get_pagination_params, paginate_query
 
 from ..models import Notification, NotificationType
+from ..models.notification import _utc_iso
 
 from shopdb.api import require_permission, Setting
 
@@ -792,8 +793,12 @@ def get_shopfloor_notifications():
         result = {
             'notificationid': n.notificationid,
             'notification': n.notification,
-            'starttime': n.starttime.isoformat() if n.starttime else None,
-            'endtime': n.endtime.isoformat() if n.endtime else None,
+            # _utc_iso, not a bare isoformat: these are stored NAIVE but hold
+            # UTC, and an untagged string is read by the browser as LOCAL time,
+            # shifting every card on the board by the tz offset. The model's
+            # to_dict already learned this; the shopfloor feed had not.
+            'starttime': _utc_iso(n.starttime),
+            'endtime': _utc_iso(n.endtime),
             'ticketnumber': n.ticketnumber,
             'link': n.link,
             'isactive': n.isactive,