feat(labels): choose copies per label, prefilled from container count

Each label in the print sheet gets an editable copy count, suggested from
the lot's latest condition-check container count (3 jars → 3 labels), and
falling back to 1. Type or step the count; the total updates live and Save
is disabled at zero. On save each seed expands into that many identical
labels.

- SeedLabelEntry.suggestedCopies; labelRows reads the latest container count
- label print sheet: per-row −/number/+ stepper, live total, expand on save
- tests: repository suggestedCopies + print-sheet copy chooser

apps/app_seeds/lib/data/variety_repository.dart

@@ -134,6 +134,7 @@ class SeedLabelEntry extends Equatable {
     this.quantity,
     this.originName,
     this.originPlace,
+    this.suggestedCopies = 1,
   });
 
   final String varietyLabel;
@@ -147,6 +148,11 @@ class SeedLabelEntry extends Equatable {
   final String? originName;
   final String? originPlace;
 
+  /// How many copies of this label to suggest — the latest condition check's
+  /// container count (e.g. 3 jars → 3 labels), or 1 when unknown. Always ≥ 1;
+  /// the print sheet prefills it and lets the keeper edit.
+  final int suggestedCopies;
+
   @override
   List<Object?> get props => [
     varietyLabel,
@@ -157,6 +163,7 @@ class SeedLabelEntry extends Equatable {
     quantity,
     originName,
     originPlace,
+    suggestedCopies,
   ];
 }
 
@@ -1325,6 +1332,28 @@ class VarietyRepository {
       (lotsByVariety[l.varietyId] ??= <Lot>[]).add(l);
     }
 
+    // Suggest one label per stored container: the latest condition check's
+    // container count (3 jars → 3 labels). `.first` is the most recent because
+    // we order by check date descending.
+    final containersByLot = <String, int>{};
+    if (lots.isNotEmpty) {
+      final checks =
+          await (_db.select(_db.conditionChecks)
+                ..where(
+                  (c) =>
+                      c.lotId.isIn(lots.map((l) => l.id).toList()) &
+                      c.isDeleted.equals(false),
+                )
+                ..orderBy([(c) => OrderingTerm.desc(c.checkedOn)]))
+              .get();
+      for (final c in checks) {
+        final count = c.containerCount;
+        if (count != null && count > 0) {
+          containersByLot.putIfAbsent(c.lotId, () => count);
+        }
+      }
+    }
+
     SeedLabelEntry entryFor(Variety v, Lot? l) {
       final hasQuantity =
           l != null &&
@@ -1346,6 +1375,7 @@ class VarietyRepository {
             : null,
         originName: l?.originName,
         originPlace: l?.originPlace,
+        suggestedCopies: l == null ? 1 : (containersByLot[l.id] ?? 1),
       );
     }