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/features/home/home_screen.dart

@@ -0,0 +1,68 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import '../../bloc/app_bloc.dart';
+import '../../bloc/app_state.dart';
+import '../../../models/models.dart';
+import '../library/library_screen.dart';
+import '../categories/categories_screen.dart';
+import '../book_details/book_details_screen.dart';
+import '../add_book/add_book_screen.dart';
+import '../scanner/scanner_screen.dart';
+import '../wishlist/wishlist_screen.dart';
+import '../settings/settings_screen.dart';
+import '../../widgets/bottom_nav.dart';
+
+class HomeScreen extends StatelessWidget {
+  const HomeScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: BlocBuilder<AppBloc, AppState>(
+        builder: (context, state) {
+          final currentScreen = state.currentScreen;
+          final hideNav = [
+            AppScreen.scanner,
+            AppScreen.details,
+            AppScreen.addBook,
+          ].contains(currentScreen);
+
+          return Stack(
+            children: [
+              _buildScreen(context, state),
+              if (!hideNav)
+                Positioned(
+                  left: 0,
+                  right: 0,
+                  bottom: 0,
+                  child: BottomNav(currentScreen: currentScreen),
+                ),
+            ],
+          );
+        },
+      ),
+    );
+  }
+
+  Widget _buildScreen(BuildContext context, AppState state) {
+    switch (state.currentScreen) {
+      case AppScreen.library:
+        return const LibraryScreen();
+      case AppScreen.categories:
+        return const CategoriesScreen();
+      case AppScreen.wishlist:
+        return const WishlistScreen();
+      case AppScreen.settings:
+        return const SettingsScreen();
+      case AppScreen.details:
+        if (state.selectedBook == null) return const SizedBox();
+        return BookDetailsScreen(book: state.selectedBook!);
+      case AppScreen.addBook:
+        return AddBookScreen(
+          initialData: state.selectedBook ?? state.prefilledData,
+        );
+      case AppScreen.scanner:
+        return const ScannerScreen();
+    }
+  }
+}