fmt: cargo fmt sweep across drifted files

No behavior change — purely whitespace/line-break cleanup that had
accumulated since the last format run.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/files.rs

@@ -1718,7 +1718,12 @@ mod tests {
             // Mock — files.rs tests don't exercise the date-override endpoints.
             // Returning a synthetic row keeps the trait satisfied without
             // depending on private DbError constructors.
-            Ok(mock_exif_row(library_id, rel_path, Some(date_taken), Some("manual".to_string())))
+            Ok(mock_exif_row(
+                library_id,
+                rel_path,
+                Some(date_taken),
+                Some("manual".to_string()),
+            ))
         }
 
         fn clear_manual_date_taken(