sync transactions with pocketbase 2

test/filter_detail_smoke_test.dart

@@ -41,7 +41,7 @@ void main() {
     await auth.init();
     bank = BankController(storage: storage);
     meta = TxMetaController(storage);
-    sync = SyncController(auth: auth, meta: meta);
+    sync = SyncController(auth: auth, meta: meta, bank: bank);
   });
 
   tearDown(() {

test/overview_smoke_test.dart

@@ -33,7 +33,7 @@ void main() {
     // seed a couple txs
     // ignore: invalid_use_of_visible_for_testing_member
     meta = TxMetaController(storage);
-    sync = SyncController(auth: auth, meta: meta);
+    sync = SyncController(auth: auth, meta: meta, bank: bank);
   });
 
   tearDown(() {

test/pb_sync_merge_test.dart

@@ -0,0 +1,100 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:myapp/models/bank.dart';
+import 'package:myapp/models/transaction_meta.dart';
+import 'package:myapp/services/pb_sync_service.dart';
+import 'package:myapp/services/storage_service.dart';
+
+void main() {
+  test('mergeTxMetaStores unions labels and metas without dropping either side',
+      () {
+    final local = TxMetaStoreData(
+      byId: {
+        'tx1': const TxMeta(labelIds: ['groceries'], notes: 'local note'),
+        'tx2': const TxMeta(recurring: true),
+      },
+      labelsByMerchant: {
+        'albert heijn': ['groceries'],
+      },
+      customLabels: const [
+        TxLabel(
+          id: 'custom_ah',
+          name: 'AH',
+          color: Color(0xFF0F766E),
+          custom: true,
+        ),
+      ],
+      labelParents: const {'custom_ah': 'groceries'},
+    );
+    final remote = TxMetaStoreData(
+      byId: {
+        'tx1': const TxMeta(labelIds: ['dining'], notes: ''),
+        'tx3': const TxMeta(notes: 'remote only'),
+      },
+      labelsByMerchant: {
+        'albert heijn': ['shopping'],
+        'jumbo': ['groceries'],
+      },
+      notesByMerchant: const {'jumbo': 'weekly'},
+      customLabels: const [
+        TxLabel(
+          id: 'custom_fuel',
+          name: 'Fuel',
+          color: Color(0xFFEA580C),
+          custom: true,
+        ),
+      ],
+    );
+
+    final merged = mergeTxMetaStores(local, remote);
+
+    expect(merged.byId['tx1']!.labelIds, containsAll(['groceries', 'dining']));
+    expect(merged.byId['tx1']!.notes, 'local note');
+    expect(merged.byId['tx2']!.recurring, isTrue);
+    expect(merged.byId['tx3']!.notes, 'remote only');
+    expect(merged.labelsByMerchant['albert heijn'],
+        containsAll(['groceries', 'shopping']));
+    expect(merged.labelsByMerchant['jumbo'], ['groceries']);
+    expect(merged.notesByMerchant['jumbo'], 'weekly');
+    expect(merged.customLabels.map((l) => l.id),
+        containsAll(['custom_ah', 'custom_fuel']));
+    expect(merged.labelParents['custom_ah'], 'groceries');
+  });
+
+  test('mergeBankTransactionLists unions without dropping either side', () {
+    const localOnly = BankTransaction(
+      date: '2024-01-02',
+      description: 'Local Cafe',
+      amount: -4.5,
+      currency: 'EUR',
+      pending: false,
+    );
+    const shared = BankTransaction(
+      date: '2024-01-01',
+      description: 'Shared Shop',
+      amount: -12.0,
+      currency: 'EUR',
+      pending: false,
+    );
+    const remoteOnly = BankTransaction(
+      date: '2024-01-03',
+      description: 'Remote Market',
+      amount: -9.25,
+      currency: 'EUR',
+      pending: true,
+    );
+
+    final merged = mergeBankTransactionLists(
+      [localOnly, shared],
+      [shared, remoteOnly],
+    );
+
+    expect(merged.length, 3);
+    expect(merged.map((t) => t.id), containsAll([
+      localOnly.id,
+      shared.id,
+      remoteOnly.id,
+    ]));
+    expect(merged.first.date, '2024-01-03');
+  });
+}