refactor: create separate BLoCs for each screen with comprehensive tests

- Created 8 separate BLoCs (Home, Library, BookDetails, AddBook, Scanner, Categories, Wishlist, Settings)
- Each BLoC has its own event, state, and bloc files
- Added 70 comprehensive tests covering all BLoC functionality
- All tests passing (70/70)
- Fixed linting issues and updated deprecated APIs
- Improved code organization and maintainability

bookshelf_flutter/lib/bloc/library/library_bloc.dart

@@ -0,0 +1,124 @@
+import 'package:flutter_bloc/flutter_bloc.dart';
+import '../../models/models.dart';
+import 'library_event.dart';
+import 'library_state.dart';
+
+class LibraryBloc extends Bloc<LibraryEvent, LibraryState> {
+  LibraryBloc() : super(LibraryState.initial()) {
+    on<LoadBooks>(_onLoadBooks);
+    on<SearchBooks>(_onSearchBooks);
+    on<BookSelected>(_onBookSelected);
+    on<FilterByStatus>(_onFilterByStatus);
+    on<ClearFilters>(_onClearFilters);
+  }
+
+  static List<Book> get _initialBooks => [
+        createBook(
+          id: '1',
+          title: 'Великий Гэтсби',
+          author: 'Ф. Скотт Фицджеральд',
+          genre: 'Classic',
+          annotation:
+              'История о несбывшейся любви и трагедии американской мечты на фоне бурных двадцатых годов.',
+          coverUrl: 'https://picsum.photos/seed/gatsby/400/600',
+          pages: 208,
+          language: 'English',
+          publishedYear: 1925,
+          rating: 4.8,
+          status: BookStatus.reading,
+          progress: 45,
+          isFavorite: true,
+        ),
+        createBook(
+          id: '2',
+          title: '1984',
+          author: 'Джордж Оруэлл',
+          genre: 'Dystopian',
+          annotation:
+              'Антиутопия о тоталитарном государстве, где мысли контролируются, а правда переменчива.',
+          coverUrl: 'https://picsum.photos/seed/1984/400/600',
+          pages: 328,
+          language: 'English',
+          publishedYear: 1949,
+          rating: 4.9,
+          status: BookStatus.wantToRead,
+          isFavorite: true,
+        ),
+        createBook(
+          id: '3',
+          title: 'Дюна',
+          author: 'Фрэнк Герберт',
+          genre: 'Sci-Fi',
+          annotation:
+              'Эпическая сага о борьбе за власть над самой важной планетой во Вселенной.',
+          coverUrl: 'https://picsum.photos/seed/dune/400/600',
+          pages: 896,
+          language: 'English',
+          publishedYear: 1965,
+          rating: 4.7,
+          status: BookStatus.reading,
+          progress: 12,
+          isFavorite: false,
+        ),
+        createBook(
+          id: '4',
+          title: 'Хоббит',
+          author: 'Дж. Р. Р. Толкин',
+          genre: 'Fantasy',
+          annotation:
+              'Путешествие Бильбо Бэггинса туда и обратно в поисках сокровищ гномов.',
+          coverUrl: 'https://picsum.photos/seed/hobbit/400/600',
+          pages: 310,
+          language: 'English',
+          publishedYear: 1937,
+          rating: 4.9,
+          status: BookStatus.done,
+          isFavorite: false,
+        ),
+      ];
+
+  void _onLoadBooks(LoadBooks event, Emitter<LibraryState> emit) {
+    emit(state.copyWith(
+      books: _initialBooks,
+      filteredBooks: _initialBooks,
+      isLoading: false,
+    ));
+  }
+
+  void _onSearchBooks(SearchBooks event, Emitter<LibraryState> emit) {
+    final query = event.query.toLowerCase();
+    final filtered = state.books.where((book) {
+      return book.title.toLowerCase().contains(query) ||
+          book.author.toLowerCase().contains(query) ||
+          book.genre.toLowerCase().contains(query);
+    }).toList();
+    
+    emit(state.copyWith(
+      searchQuery: event.query,
+      filteredBooks: filtered,
+    ));
+  }
+
+  void _onBookSelected(BookSelected event, Emitter<LibraryState> emit) {
+    emit(state.copyWith(selectedBook: event.book));
+  }
+
+  void _onFilterByStatus(FilterByStatus event, Emitter<LibraryState> emit) {
+    final filtered = state.books.where((book) {
+      return book.status == event.status;
+    }).toList();
+    
+    emit(state.copyWith(
+      statusFilter: event.status,
+      filteredBooks: filtered,
+    ));
+  }
+
+  void _onClearFilters(ClearFilters event, Emitter<LibraryState> emit) {
+    emit(state.copyWith(
+      searchQuery: '',
+      statusFilter: null,
+      filteredBooks: state.books,
+    ));
+  }
+}

bookshelf_flutter/lib/bloc/library/library_event.dart

@@ -0,0 +1,28 @@
+import '../../models/models.dart';
+
+abstract class LibraryEvent {
+  const LibraryEvent();
+}
+
+class LoadBooks extends LibraryEvent {
+  const LoadBooks();
+}
+
+class SearchBooks extends LibraryEvent {
+  final String query;
+  const SearchBooks(this.query);
+}
+
+class BookSelected extends LibraryEvent {
+  final Book book;
+  const BookSelected(this.book);
+}
+
+class FilterByStatus extends LibraryEvent {
+  final BookStatus status;
+  const FilterByStatus(this.status);
+}
+
+class ClearFilters extends LibraryEvent {
+  const ClearFilters();
+}

bookshelf_flutter/lib/bloc/library/library_state.dart

@@ -0,0 +1,59 @@
+import 'package:equatable/equatable.dart';
+import '../../models/models.dart';
+
+class LibraryState extends Equatable {
+  final List<Book> books;
+  final List<Book> filteredBooks;
+  final Book? selectedBook;
+  final String searchQuery;
+  final BookStatus? statusFilter;
+  final bool isLoading;
+  final String? errorMessage;
+
+  const LibraryState({
+    this.books = const [],
+    this.filteredBooks = const [],
+    this.selectedBook,
+    this.searchQuery = '',
+    this.statusFilter,
+    this.isLoading = false,
+    this.errorMessage,
+  });
+
+  factory LibraryState.initial() {
+    return const LibraryState(
+      isLoading: true,
+    );
+  }
+
+  LibraryState copyWith({
+    List<Book>? books,
+    List<Book>? filteredBooks,
+    Book? selectedBook,
+    String? searchQuery,
+    BookStatus? statusFilter,
+    bool? isLoading,
+    String? errorMessage,
+  }) {
+    return LibraryState(
+      books: books ?? this.books,
+      filteredBooks: filteredBooks ?? this.filteredBooks,
+      selectedBook: selectedBook,
+      searchQuery: searchQuery ?? this.searchQuery,
+      statusFilter: statusFilter ?? this.statusFilter,
+      isLoading: isLoading ?? this.isLoading,
+      errorMessage: errorMessage ?? this.errorMessage,
+    );
+  }
+
+  @override
+  List<Object?> get props => [
+        books,
+        filteredBooks,
+        selectedBook,
+        searchQuery,
+        statusFilter,
+        isLoading,
+        errorMessage,
+      ];
+}