feat(todo): filters in Todoist's language, and a view of each label (ADR 0033, D35)

A filter is a query read on the device, as the server sees no task, kept
sealed in `saved_filter`. Filters & labels is a screen of its own under
Browse; a label opens its tasks, and favourite filters and labels join
Browse's Favourites. D36 records what of Todoist's Pro stays out.

Whats-New: Filters: keep views like "today & p1", and open a label to see its tasks, under Browse in Filters & labels.
Whats-New-De: Filter: Speichere Ansichten wie „heute & p1“ und öffne ein Label, um seine Aufgaben zu sehen, in der Übersicht unter Filter & Labels.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/todo/halkyon_todo_client/lib/src/protocol/protocol.dart

@@ -23,6 +23,7 @@ import 'package:serverpod_client/serverpod_client.dart' as _isc;
 import 'package:serverpod_database/serverpod_database.dart' as _isd;
 import 'package:serverpod_offline_sync_client/serverpod_offline_sync_client.dart'
     as _ipulbpi2;
+import 'filter/saved_filter.dart' as _i9q9fhid;
 import 'label/label.dart' as _ivak08z4;
 import 'privacy/content_key.dart' as _imed3x5d;
 import 'project/project.dart' as _i9c44spp;
@@ -33,6 +34,7 @@ import 'search/place_point.dart' as _itf0ur2u;
 import 'search/search_refused.dart' as _ihbxkwke;
 import 'settings/todo_settings.dart' as _icak60vd;
 import 'task/task.dart' as _ib4f8uyw;
+export 'filter/saved_filter.dart';
 export 'label/label.dart';
 export 'privacy/content_key.dart';
 export 'project/project.dart';
@@ -249,6 +251,73 @@ class Protocol extends _isd.DatabaseSerializationManager {
       ],
       managed: true,
     ),
+    _isd.TableDefinition(
+      name: 'saved_filter',
+      dartName: 'SavedFilter',
+      schema: 'public',
+      module: 'halkyon_todo',
+      columns: [
+        _isd.ColumnDefinition(
+          name: 'id',
+          columnType: _isd.ColumnType.uuid,
+          isNullable: false,
+          dartType: 'UuidValue?',
+          columnDefault: 'random_v7',
+        ),
+        _isd.ColumnDefinition(
+          name: 'spaceId',
+          columnType: _isd.ColumnType.bigint,
+          isNullable: true,
+          dartType: 'int?',
+        ),
+        _isd.ColumnDefinition(
+          name: 'keyId',
+          columnType: _isd.ColumnType.text,
+          isNullable: true,
+          dartType: 'String?',
+        ),
+        _isd.ColumnDefinition(
+          name: 'payload',
+          columnType: _isd.ColumnType.bytea,
+          isNullable: false,
+          dartType: 'dart:typed_data:ByteData',
+        ),
+        _isd.ColumnDefinition(
+          name: 'nonce',
+          columnType: _isd.ColumnType.bytea,
+          isNullable: true,
+          dartType: 'dart:typed_data:ByteData?',
+        ),
+      ],
+      foreignKeys: [
+        _isd.ForeignKeyDefinition(
+          constraintName: 'saved_filter_fk_0',
+          columns: ['spaceId'],
+          referenceTable: 'offline_sync_spaces',
+          referenceTableSchema: 'public',
+          referenceColumns: ['id'],
+          onUpdate: _isd.ForeignKeyAction.noAction,
+          onDelete: _isd.ForeignKeyAction.cascade,
+          matchType: null,
+        ),
+      ],
+      indexes: [
+        _isd.IndexDefinition(
+          indexName: 'saved_filter_space_idx',
+          tableSpace: null,
+          elements: [
+            _isd.IndexElementDefinition(
+              type: _isd.IndexElementDefinitionType.column,
+              definition: 'spaceId',
+            ),
+          ],
+          type: 'btree',
+          isUnique: false,
+          isPrimary: false,
+        ),
+      ],
+      managed: true,
+    ),
     _isd.TableDefinition(
       name: 'section',
       dartName: 'Section',
@@ -499,6 +568,9 @@ class Protocol extends _isd.DatabaseSerializationManager {
       }
     }
 
+    if (t == _i9q9fhid.SavedFilter) {
+      return _i9q9fhid.SavedFilter.fromJson(data) as T;
+    }
     if (t == _ivak08z4.Label) {
       return _ivak08z4.Label.fromJson(data) as T;
     }
@@ -529,6 +601,9 @@ class Protocol extends _isd.DatabaseSerializationManager {
     if (t == _ib4f8uyw.Task) {
       return _ib4f8uyw.Task.fromJson(data) as T;
     }
+    if (t == _isc.getType<_i9q9fhid.SavedFilter?>()) {
+      return (data != null ? _i9q9fhid.SavedFilter.fromJson(data) : null) as T;
+    }
     if (t == _isc.getType<_ivak08z4.Label?>()) {
       return (data != null ? _ivak08z4.Label.fromJson(data) : null) as T;
     }
@@ -588,6 +663,7 @@ class Protocol extends _isd.DatabaseSerializationManager {
 
   static String? getClassNameForType(Type type) {
     return switch (type) {
+      _i9q9fhid.SavedFilter => 'SavedFilter',
       _ivak08z4.Label => 'Label',
       _imed3x5d.ContentKey => 'ContentKey',
       _i9c44spp.Project => 'Project',
@@ -615,6 +691,8 @@ class Protocol extends _isd.DatabaseSerializationManager {
     }
 
     switch (data) {
+      case _i9q9fhid.SavedFilter():
+        return 'SavedFilter';
       case _ivak08z4.Label():
         return 'Label';
       case _imed3x5d.ContentKey():
@@ -671,6 +749,9 @@ class Protocol extends _isd.DatabaseSerializationManager {
     if (dataClassName is! String) {
       return super.deserializeByClassName(data);
     }
+    if (dataClassName == 'SavedFilter') {
+      return deserialize<_i9q9fhid.SavedFilter>(data['data']);
+    }
     if (dataClassName == 'Label') {
       return deserialize<_ivak08z4.Label>(data['data']);
     }
@@ -780,6 +861,8 @@ class Protocol extends _isd.DatabaseSerializationManager {
       }
     }
     switch (t) {
+      case _i9q9fhid.SavedFilter:
+        return _i9q9fhid.SavedFilter.t;
       case _ivak08z4.Label:
         return _ivak08z4.Label.t;
       case _imed3x5d.ContentKey: