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/brick/db/schema.g.dart

@@ -1,22 +1,24 @@
 // GENERATED CODE DO NOT EDIT
 // This file should be version controlled
 import 'package:brick_sqlite/db.dart';
-part '20260927030348.migration.dart';
+part '20260928065256.migration.dart';
 part '20260411041808.migration.dart';
 part '20260411042152.migration.dart';
 part '20260926162926.migration.dart';
+part '20260927030348.migration.dart';
 
 /// All intelligently-generated migrations from all `@Migratable` classes on disk
 final migrations = <Migration>{
-  const Migration20260927030348(),
+  const Migration20260928065256(),
   const Migration20260411041808(),
   const Migration20260411042152(),
   const Migration20260926162926(),
+  const Migration20260927030348(),
 };
 
 /// A consumable database structure including the latest generated migration.
 final schema = Schema(
-  20260926162926,
+  20260927030348,
   generatorVersion: 1,
   tables: <SchemaTable>{
     SchemaTable(
@@ -271,6 +273,7 @@ final schema = Schema(
         SchemaColumn('it_service_request_id', Column.varchar),
         SchemaColumn('announcement_id', Column.varchar),
         SchemaColumn('message_id', Column.integer),
+        SchemaColumn('day_sheet_id', Column.varchar),
         SchemaColumn('type', Column.varchar),
         SchemaColumn('created_at', Column.datetime),
         SchemaColumn('read_at', Column.datetime),