categorize multiple tags

lib/providers/tx_meta_provider.dart

@@ -521,10 +521,15 @@ class TxMetaController extends ChangeNotifier {
   }
 
   /// Replace labels on every transaction in [txs] (per-id overrides).
+  ///
+  /// When [matchPattern] is set (apply-to-matched), also refreshes the
+  /// merchant rule so future transactions matching the pattern inherit the
+  /// full label set (parent + sub-labels).
   Future<void> setLabelsForMany(
     List<BankTransaction> txs,
-    List<String> labelIds,
-  ) async {
+    List<String> labelIds, {
+    String? matchPattern,
+  }) async {
     if (txs.isEmpty) return;
 
     final expanded = expandWithAncestors([
@@ -545,6 +550,22 @@ class TxMetaController extends ChangeNotifier {
           : current.copyWith(labelIds: unique);
     }
     _byId = nextById;
+
+    final pattern = (matchPattern ?? '').trim().toLowerCase();
+    if (pattern.isNotEmpty) {
+      final nextRules = Map<String, List<String>>.of(_labelsByMerchant);
+      if (unique.isEmpty) {
+        nextRules.remove(pattern);
+        for (final tx in txs) {
+          nextRules.remove(tx.merchantKey);
+          nextRules.remove(tx.descriptionKey);
+        }
+      } else {
+        nextRules[pattern] = unique;
+      }
+      _labelsByMerchant = nextRules;
+    }
+
     _schedulePersist();
   }