feat(diary): Checkboxes for product when diet is chosen

lib/features/diary/models/state.dart

@@ -0,0 +1,14 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'state.freezed.dart';
+part 'state.g.dart';
+
+@freezed
+class State with _$State {
+  const factory State({
+    required bool has_chosen_diet,
+    required bool has_chosen_plan,
+  }) = _State;
+
+  factory State.fromJson(Map<String, Object?> json) => _$StateFromJson(json);
+}