nice overview working

lib/providers/bank_provider.dart

@@ -30,6 +30,7 @@ class BankController extends ChangeNotifier {
       _remoteTransactions = cached.transactions;
     }
     _importedTransactions = _storage?.loadImportedTransactions() ?? const [];
+    _invalidateMerged();
   }
 
   final IngtrakApi _api;
@@ -39,6 +40,7 @@ class BankController extends ChangeNotifier {
   BankBalance? _balance;
   List<BankTransaction> _remoteTransactions = const [];
   List<BankTransaction> _importedTransactions = const [];
+  List<BankTransaction>? _mergedTransactions;
 
   bool _isLoading = false;
   bool _isConnecting = false;
@@ -50,8 +52,16 @@ class BankController extends ChangeNotifier {
   BankBalance? get balance => _balance;
 
   /// Remote API txs merged with locally imported CSV txs (deduped).
+  ///
+  /// Cached — [mergeTransactions] is O(n·m) and was re-running on every
+  /// `bank.transactions` read during rebuilds.
   List<BankTransaction> get transactions =>
-      mergeTransactions(_remoteTransactions, _importedTransactions);
+      _mergedTransactions ??=
+          mergeTransactions(_remoteTransactions, _importedTransactions);
+
+  void _invalidateMerged() {
+    _mergedTransactions = null;
+  }
 
   int get importedCount => _importedTransactions.length;
   bool get isLoading => _isLoading;
@@ -121,6 +131,7 @@ class BankController extends ChangeNotifier {
           _remoteTransactions,
           _importedTransactions,
         );
+        _invalidateMerged();
         await _persistImported();
       }
       return result;
@@ -139,6 +150,7 @@ class BankController extends ChangeNotifier {
 
   Future<void> clearImportedTransactions() async {
     _importedTransactions = const [];
+    _invalidateMerged();
     await _storage?.clearImportedTransactions();
     notifyListeners();
   }
@@ -210,6 +222,7 @@ class BankController extends ChangeNotifier {
         _remoteTransactions,
         _importedTransactions,
       );
+      _invalidateMerged();
       await _persistImported();
       _error = null;
     } on IngtrakApiException catch (error) {
@@ -218,6 +231,7 @@ class BankController extends ChangeNotifier {
         _status = ConnectStatus.disconnected;
         _balance = null;
         _remoteTransactions = const [];
+        _invalidateMerged();
         _error = error.message;
         await _persistCache();
       } else if (!hasData) {