fix tx listing

lib/models/transaction_meta.dart

@@ -3,6 +3,8 @@ library;
 
 import 'package:flutter/material.dart';
 
+import 'bank.dart';
+
 /// A spend/income label shown on transactions.
 class TxLabel {
   const TxLabel({
@@ -380,6 +382,77 @@ String merchantKeyFromDescription(String description) {
 String defaultSimilarPattern(String description) =>
     merchantKeyFromDescription(description);
 
+/// Income / expense / any — used by list filters and similar matching.
+enum TxFlowFilter { all, income, expense }
+
+/// Absolute-amount filter for transaction lists (exact and/or range).
+class TxAmountRange {
+  const TxAmountRange({this.exact, this.min, this.max});
+
+  /// Exact absolute amount; when set, takes precedence over [min]/[max].
+  final double? exact;
+
+  /// Inclusive lower bound on absolute amount; null = no lower bound.
+  final double? min;
+
+  /// Inclusive upper bound on absolute amount; null = no upper bound.
+  final double? max;
+
+  bool get isActive => exact != null || min != null || max != null;
+}
+
+bool txMatchesAmountRange(BankTransaction tx, TxAmountRange range) {
+  if (!range.isActive) return true;
+  final abs = tx.amount.abs();
+  if (range.exact != null) {
+    // Match to the nearest cent.
+    return (abs - range.exact!).abs() < 0.005;
+  }
+  if (range.min != null && abs < range.min!) return false;
+  if (range.max != null && abs > range.max!) return false;
+  return true;
+}
+
+/// Criteria for finding similar transactions (apply-to-similar).
+class SimilarMatchCriteria {
+  const SimilarMatchCriteria({
+    required this.pattern,
+    this.flow = TxFlowFilter.all,
+  });
+
+  /// Plain contains needle, or `/regex/`.
+  final String pattern;
+
+  /// Limit matches to income, expense, or either.
+  final TxFlowFilter flow;
+
+  SimilarMatchCriteria copyWith({
+    String? pattern,
+    TxFlowFilter? flow,
+  }) {
+    return SimilarMatchCriteria(
+      pattern: pattern ?? this.pattern,
+      flow: flow ?? this.flow,
+    );
+  }
+}
+
+bool txMatchesFlow(BankTransaction tx, TxFlowFilter flow) {
+  switch (flow) {
+    case TxFlowFilter.all:
+      return true;
+    case TxFlowFilter.income:
+      return tx.amount > 0;
+    case TxFlowFilter.expense:
+      return tx.amount < 0;
+  }
+}
+
+bool txMatchesSimilarCriteria(BankTransaction tx, SimilarMatchCriteria criteria) {
+  if (!txMatchesFlow(tx, criteria.flow)) return false;
+  return descriptionMatchesPattern(tx.description, criteria.pattern);
+}
+
 /// Match [description] against a simple contains needle or `/regex/`.
 bool descriptionMatchesPattern(String description, String pattern) {
   final raw = pattern.trim();