fix: resolve file management operations not working (#83)

- Fix rename: context menu was nullifying target reference before rename dialog could use it
- Fix delete files/folders: auth extractors were mandatory, causing 401 when auth not configured
- Fix view-file: async fetch race condition with context menu cleanup
- Fix orphaned ID mappings on file deletion
- Fix Authorization: Bearer null headers sent without token
- Add OptionalUserId and OptionalAuthUser infallible extractors

src/infrastructure/repositories/file_fs_write_repository.rs

@@ -431,6 +431,13 @@ impl FileWritePort for FileFsWriteRepository {
         }
 
         self.delete_file_non_blocking(abs_path).await.map_err(map_repo_err)?;
+
+        // Clean up the ID mapping so we don't leave orphaned entries
+        if let Err(e) = self.id_mapping_service.remove_id(id).await {
+            tracing::warn!("Failed to remove ID mapping for deleted file {}: {}", id, e);
+        }
+        let _ = self.id_mapping_service.save_changes().await;
+
         Ok(())
     }