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/bloc/home_event.dart

@@ -0,0 +1,14 @@
+import '../../../models/models.dart';
+
+abstract class HomeEvent {
+  const HomeEvent();
+}
+
+class LoadHomeData extends HomeEvent {
+  const LoadHomeData();
+}
+
+class NavigateToScreen extends HomeEvent {
+  final AppScreen screen;
+  const NavigateToScreen(this.screen);
+}