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/settings/bloc/settings_event.dart

@@ -0,0 +1,25 @@
+abstract class SettingsEvent {
+  const SettingsEvent();
+}
+
+class LoadSettings extends SettingsEvent {
+  const LoadSettings();
+}
+
+class UpdateTheme extends SettingsEvent {
+  final bool isDarkMode;
+  const UpdateTheme(this.isDarkMode);
+}
+
+class UpdateLanguage extends SettingsEvent {
+  final String language;
+  const UpdateLanguage(this.language);
+}
+
+class ToggleNotifications extends SettingsEvent {
+  const ToggleNotifications();
+}
+
+class ClearData extends SettingsEvent {
+  const ClearData();
+}