feat(screenshots): real maize photo as hero variety, surfaced at top of inventory

apps/app_seeds/test/screenshots/screenshot_support.dart

@@ -1,4 +1,6 @@
 import 'dart:convert';
+import 'dart:io';
+import 'dart:typed_data';
 
 import 'package:commons_core/commons_core.dart';
 import 'package:drift/drift.dart' show Value;
@@ -149,10 +151,14 @@ Future<SeededInventory> seedShowcase(
   final sow = monthsToMask(const [3, 4, 5]);
   final harvest = monthsToMask(const [8, 9]);
 
-  // Varieties render with the app's default coloured-initial disc avatar —
-  // the on-brand default when no photo is set — so no image decoding is needed.
-  Future<String> add(String label, String family) async {
-    final id = await repo.addQuickVariety(label: label, category: family);
+  // Most varieties use the app's default coloured-initial disc avatar; the hero
+  // (maize) carries a real photo (below).
+  Future<String> add(String label, String family, {Uint8List? photo}) async {
+    final id = await repo.addQuickVariety(
+      label: label,
+      category: family,
+      photoBytes: photo,
+    );
     await (db.update(db.varieties)..where((v) => v.id.equals(id))).write(
       VarietiesCompanion(
         sowMonths: Value(sow),
@@ -162,27 +168,34 @@ Future<SeededInventory> seedShowcase(
     return id;
   }
 
-  final tomato = await add('Cherry tomato', 'Solanaceae');
+  // A real photo of red & white flint corn is the hero variety, so the detail
+  // shot shows a genuine seed photo. Loaded from the committed test fixture
+  // (CWD is the package root under `flutter test`).
+  final maizePhoto = await File(
+    'test/screenshots/fixtures/maize.jpg',
+  ).readAsBytes();
+  final maize = await add('Painted flint corn', 'Poaceae', photo: maizePhoto);
   await repo.addLot(
-    varietyId: tomato,
+    varietyId: maize,
     harvestYear: 2024,
-    quantity: const Quantity(kind: QuantityKind.handful),
+    quantity: const Quantity(kind: QuantityKind.cob, count: 6),
     originName: 'Community seed swap',
     abundance: Abundance.plentyToShare,
     offerStatus: OfferStatus.shared,
   );
   await repo.addLot(
-    varietyId: tomato,
+    varietyId: maize,
     harvestYear: 2023,
     quantity: const Quantity(kind: QuantityKind.packet, count: 1),
     offerStatus: OfferStatus.exchange,
   );
 
-  await add('Climbing bean', 'Fabaceae');
-  await add('Sunflower', 'Asteraceae');
-  await add('Sweet basil', 'Lamiaceae');
-  await add('Rainbow chard', 'Amaranthaceae');
-  await add('Purple carrot', 'Apiaceae');
+  // The rest sit in families that sort at/after Poaceae, so the maize (and its
+  // photo) stays the first, top-of-list group in the inventory shot.
+  await add('Common buckwheat', 'Polygonaceae');
+  await add('Alpine strawberry', 'Rosaceae');
+  await add('Cherry tomato', 'Solanaceae');
+  await add('Sweet pepper', 'Solanaceae');
 
-  return SeededInventory(tomato);
+  return SeededInventory(maize);
 }