feat(notifications): day sheet notification types

Add daySheetId field to NotificationItem model (Brick-managed), extract
notificationTitle/notificationIcon to top-level testable functions, add
five day-sheet notification cases, and wire tap/banner routing for
day-sheet detail and approvals tab.
Co-Authored-By: claude-flow <ruv@ruv.net>

lib/services/notification_bridge.dart

@@ -106,6 +106,11 @@ class _NotificationBridgeState extends ConsumerState<NotificationBridge>
         'isr_approved' => 'IT Service Request approved',
         'isr_status_changed' => 'IT Service Request updated',
         'isr_assigned' => 'New IT Service Request assigned',
+        'day_sheet_submitted' => 'Day sheet submitted',
+        'day_sheet_disapproved' => 'Day sheet disapproved',
+        'day_sheet_justified' => 'Day sheet justified',
+        'day_sheet_approved' => 'Day sheet approved',
+        'day_sheet_digest' => 'Day sheets awaiting review',
         _ => 'New notification',
       };
 
@@ -121,7 +126,13 @@ class _NotificationBridgeState extends ConsumerState<NotificationBridge>
           action: SnackBarAction(
             label: 'View',
             onPressed: () => _goToDetail(
-              route: item.announcementId != null ? '/announcements' : null,
+              route: item.announcementId != null
+                  ? '/announcements'
+                  : item.type == 'day_sheet_digest'
+                  ? '/programmer-tasks?tab=approvals'
+                  : item.daySheetId != null
+                  ? '/programmer-tasks/day-sheets/${item.daySheetId}'
+                  : null,
               taskId: item.taskId,
               ticketId: item.ticketId,
               itServiceRequestId: item.itServiceRequestId,