修正配置回滚代码的Rust格式

按rustfmt要求调整错误信息和测试断言换行
通过仓库check:rustfmt、编码和diff检查

apps/ai-game-creator-shell/src-tauri/src/config.rs

@@ -3708,7 +3708,10 @@ pub(crate) fn write_game_creator_config_batch(writes: &[(PathBuf, String)]) -> R
                         .map_err(|error| error.to_string()),
                 };
                 if let Err(restore_error) = restored {
-                    error.push_str(&format!("；恢复配置失败：{}: {restore_error}", path.display()));
+                    error.push_str(&format!(
+                        "；恢复配置失败：{}: {restore_error}",
+                        path.display()
+                    ));
                 }
             }
             return Err(error);

apps/ai-game-creator-shell/src-tauri/src/tests/configuration.rs

@@ -832,7 +832,10 @@ fn app_config_batch_restores_main_when_overlay_write_fails() {
         } else {
             assert!(!main.exists());
         }
-        assert_eq!(fs::read_to_string(&overlay).expect("unchanged overlay"), original);
+        assert_eq!(
+            fs::read_to_string(&overlay).expect("unchanged overlay"),
+            original
+        );
         fs::remove_dir_all(root).expect("cleanup config dir");
     }
 }