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/main.dart

@@ -0,0 +1,43 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'bloc/app_bloc.dart';
+import 'screens/home_screen.dart';
+
+void main() {
+  runApp(const BookshelfApp());
+}
+
+class BookshelfApp extends StatelessWidget {
+  const BookshelfApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Книжная полка',
+      debugShowCheckedModeBanner: false,
+      theme: ThemeData(
+        useMaterial3: true,
+        brightness: Brightness.dark,
+        scaffoldBackgroundColor: const Color(0xFF112116),
+        colorScheme: ColorScheme.dark(
+          primary: const Color(0xFF17CF54),
+          surface: const Color(0xFF1A3222),
+          surfaceContainer: const Color(0xFF244730),
+          onSurface: Colors.white,
+          onSurfaceVariant: const Color(0xFF93C8A5),
+        ),
+        appBarTheme: const AppBarTheme(
+          backgroundColor: Color(0xFF112116),
+          elevation: 0,
+          centerTitle: true,
+        ),
+        cardColor: const Color(0xFF1A3023),
+        fontFamily: 'Inter',
+      ),
+      home: BlocProvider(
+        create: (context) => AppBloc(),
+        child: const HomeScreen(),
+      ),
+    );
+  }
+}