fix+test: check hash ref count on copy-on-write (a duplicated beeing updated)

src/infrastructure/services/dedup_service.rs

@@ -44,8 +44,8 @@ use std::sync::Arc;
 use tokio::fs;
 use tokio::io::{AsyncReadExt, AsyncSeekExt};
 
-use crate::application::ports::blob_storage_ports::BlobStorageBackend;
 use crate::application::ports::blob_lifecycle::BlobDeletionHook;
+use crate::application::ports::blob_storage_ports::BlobStorageBackend;
 use crate::application::ports::dedup_ports::{
     BlobMetadataDto, DedupPort, DedupResultDto, DedupStatsDto,
 };

src/infrastructure/services/thumbnail_service.rs

@@ -25,8 +25,8 @@ use tokio::time::timeout;
 use crate::application::ports::thumbnail_ports::{
     ThumbnailPort, ThumbnailSize as PortThumbnailSize, ThumbnailStatsDto,
 };
-use crate::infrastructure::services::dedup_service::DedupService;
 use crate::domain::errors::{DomainError, ErrorKind};
+use crate::infrastructure::services::dedup_service::DedupService;
 
 /// Thumbnail sizes supported by the system
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]