basic csv loader, transaction list & half done stats page

lib/domains/account/models/transaction_date.dart

@@ -0,0 +1,19 @@
+import 'package:formz/formz.dart';
+
+enum TransactionDateValidationError {
+  empty('Date empty'),
+  invalid('Date invalid');
+
+  final String message;
+  const TransactionDateValidationError(this.message);
+}
+
+class TransactionDate extends FormzInput<DateTime?, TransactionDateValidationError> {
+  const TransactionDate.pure() : super.pure(null);
+  const TransactionDate.dirty([super.value]) : super.dirty();
+
+  @override
+  TransactionDateValidationError? validator(DateTime? value) {
+    return value == null ? TransactionDateValidationError.empty : null;
+  }
+}