Fix import paths and test issues

- Fixed test file import paths to point to correct Bloc file locations
- Fixed Bloc file import paths for models (../../../models/models.dart)
- Added explicit type annotations to resolve null safety warnings
- Fixed null safety issues in wishlist_bloc_test.dart
- All 70 tests now passing

bookshelf_flutter/lib/models/book.dart

@@ -0,0 +1,127 @@
+import 'book_status.dart';
+
+// Book record - using Dart records as data classes
+typedef Book = ({
+  String id,
+  String title,
+  String author,
+  String genre,
+  String annotation,
+  String? coverUrl,
+  int? pages,
+  String? language,
+  int? publishedYear,
+  double? rating,
+  BookStatus status,
+  int? progress,
+  bool isFavorite,
+});
+
+// Helper function to create a Book record
+Book createBook({
+  required String id,
+  required String title,
+  required String author,
+  required String genre,
+  required String annotation,
+  String? coverUrl,
+  int? pages,
+  String? language,
+  int? publishedYear,
+  double? rating,
+  required BookStatus status,
+  int? progress,
+  required bool isFavorite,
+}) {
+  return (
+    id: id,
+    title: title,
+    author: author,
+    genre: genre,
+    annotation: annotation,
+    coverUrl: coverUrl,
+    pages: pages,
+    language: language,
+    publishedYear: publishedYear,
+    rating: rating,
+    status: status,
+    progress: progress,
+    isFavorite: isFavorite,
+  );
+}
+
+// Extension to create Book from partial data
+extension BookExtension on Book {
+  Book copyWith({
+    String? id,
+    String? title,
+    String? author,
+    String? genre,
+    String? annotation,
+    String? coverUrl,
+    int? pages,
+    String? language,
+    int? publishedYear,
+    double? rating,
+    BookStatus? status,
+    int? progress,
+    bool? isFavorite,
+  }) {
+    return createBook(
+      id: id ?? this.id,
+      title: title ?? this.title,
+      author: author ?? this.author,
+      genre: genre ?? this.genre,
+      annotation: annotation ?? this.annotation,
+      coverUrl: coverUrl ?? this.coverUrl,
+      pages: pages ?? this.pages,
+      language: language ?? this.language,
+      publishedYear: publishedYear ?? this.publishedYear,
+      rating: rating ?? this.rating,
+      status: status ?? this.status,
+      progress: progress ?? this.progress,
+      isFavorite: isFavorite ?? this.isFavorite,
+    );
+  }
+
+  // Convert to JSON for storage/transport
+  Map<String, dynamic> toJson() {
+    return {
+      'id': id,
+      'title': title,
+      'author': author,
+      'genre': genre,
+      'annotation': annotation,
+      'coverUrl': coverUrl,
+      'pages': pages,
+      'language': language,
+      'publishedYear': publishedYear,
+      'rating': rating,
+      'status': status.name,
+      'progress': progress,
+      'isFavorite': isFavorite,
+    };
+  }
+
+  // Create Book from JSON
+  static Book fromJson(Map<String, dynamic> json) {
+    return (
+      id: json['id'] as String,
+      title: json['title'] as String,
+      author: json['author'] as String,
+      genre: json['genre'] as String,
+      annotation: json['annotation'] as String,
+      coverUrl: json['coverUrl'] as String?,
+      pages: json['pages'] as int?,
+      language: json['language'] as String?,
+      publishedYear: json['publishedYear'] as int?,
+      rating: (json['rating'] as num?)?.toDouble(),
+      status: BookStatus.values.firstWhere(
+        (e) => e.name == json['status'],
+        orElse: () => BookStatus.wantToRead,
+      ),
+      progress: json['progress'] as int?,
+      isFavorite: json['isFavorite'] as bool? ?? false,
+    );
+  }
+}