Initial commit: CookIT recipe collection and week planner

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lib/src/sharing/shared_recipe.dart

@@ -0,0 +1,20 @@
+import 'dart:typed_data';
+
+import '../bundle/bundle_codec.dart';
+import '../recipes/models/recipe.dart';
+
+/// A Recipe arriving from another cook – scanned from a Recipe Code or opened
+/// from a one-Recipe Recipe Bundle – before it gets an id, a Course and
+/// Photos in this collection.
+class SharedRecipe {
+  const SharedRecipe({required this.recipe, this.courseName, this.units = const [], this.photos = const []});
+
+  final Recipe recipe;
+  final String? courseName;
+
+  /// The sender's own units this Recipe uses.
+  final List<BundleUnit> units;
+
+  /// Photo files in order (only a Recipe Bundle carries them).
+  final List<Uint8List> photos;
+}