fixes before build

lib/models/product.dart

@@ -72,4 +72,4 @@ class Product {
   }
 }
 
-enum ProductSort { name, preferred, start }
+enum ProductSort { name, preferred, favourite }

lib/models/supermarket.dart

@@ -50,6 +50,32 @@ class Supermarket {
   }
 }
 
+/// Puts stores with the most recent trip first, then earlier trips, then unused.
+List<Supermarket> sortStoresByLastTrip(
+  List<Supermarket> stores,
+  Iterable<String> lastTripStores,
+) {
+  final rank = <String, int>{};
+  var next = 0;
+  for (final name in lastTripStores) {
+    final key = name.trim().toUpperCase();
+    if (key.isEmpty || rank.containsKey(key)) continue;
+    rank[key] = next++;
+  }
+
+  final sorted = [...stores];
+  sorted.sort((a, b) {
+    final aRank = rank[a.name.trim().toUpperCase()] ?? 1 << 20;
+    final bRank = rank[b.name.trim().toUpperCase()] ?? 1 << 20;
+    final byTrip = aRank.compareTo(bRank);
+    if (byTrip != 0) return byTrip;
+    final byOrder = a.sortOrder.compareTo(b.sortOrder);
+    if (byOrder != 0) return byOrder;
+    return a.name.toLowerCase().compareTo(b.name.toLowerCase());
+  });
+  return sorted;
+}
+
 /// Palette offered when the user picks a store color.
 const List<int> kStoreColorPalette = [
   0xFFEEC21B, // Jumbo yellow