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/20260928065256.migration.dart

@@ -0,0 +1,36 @@
+// GENERATED CODE EDIT WITH CAUTION
+// THIS FILE **WILL NOT** BE REGENERATED
+// This file should be version controlled and can be manually edited.
+part of 'schema.g.dart';
+
+// While migrations are intelligently created, the difference between some commands, such as
+// DropTable vs. RenameTable, cannot be determined. For this reason, please review migrations after
+// they are created to ensure the correct inference was made.
+
+// The migration version must **always** mirror the file name
+
+const List<MigrationCommand> _migration_20260928065256_up = [
+  InsertColumn('day_sheet_id', Column.varchar, onTable: 'NotificationItem')
+];
+
+const List<MigrationCommand> _migration_20260928065256_down = [
+  DropColumn('day_sheet_id', onTable: 'NotificationItem')
+];
+
+//
+// DO NOT EDIT BELOW THIS LINE
+//
+
+@Migratable(
+  version: '20260928065256',
+  up: _migration_20260928065256_up,
+  down: _migration_20260928065256_down,
+)
+class Migration20260928065256 extends Migration {
+  const Migration20260928065256()
+    : super(
+        version: 20260928065256,
+        up: _migration_20260928065256_up,
+        down: _migration_20260928065256_down,
+      );
+}

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),