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/scanner/bloc/scanner_event.dart

@@ -0,0 +1,20 @@
+abstract class ScannerEvent {
+  const ScannerEvent();
+}
+
+class StartScanning extends ScannerEvent {
+  const StartScanning();
+}
+
+class StopScanning extends ScannerEvent {
+  const StopScanning();
+}
+
+class BookDetected extends ScannerEvent {
+  final Map<String, dynamic> bookData;
+  const BookDetected(this.bookData);
+}
+
+class ClearDetectedBook extends ScannerEvent {
+  const ClearDetectedBook();
+}