fix(i18n): translate backend errors at UI boundaries

src-tauri/src/commands/agents.rs

@@ -226,7 +226,7 @@ async fn ensure_no_agent_update_blockers(state: &AppState, db_types: &[String])
         return Ok(());
     }
     let labels = blockers.into_iter().map(|blocker| blocker.label).collect::<Vec<_>>().join(", ");
-    Err(format!("请先关闭以下数据库连接后再更新驱动: {labels}"))
+    Err(format!("Close these database connections before updating drivers: {labels}"))
 }
 
 async fn ensure_no_offline_import_blockers(state: &AppState, plan: &OfflineImportPlan) -> Result<(), String> {

src-tauri/src/commands/fs_open.rs

@@ -63,7 +63,7 @@ fn validate_path(raw: &str) -> Result<PathBuf, String> {
         return Err(format!("path is not absolute: {expanded}"));
     }
     if !path.exists() {
-        return Err(format!("文件不存在: {expanded}"));
+        return Err(format!("file does not exist: {expanded}"));
     }
     Ok(path)
 }
@@ -151,7 +151,7 @@ mod tests {
             "/__dbx_definitely_missing__/foo.sqlite".to_string()
         };
         let err = validate_path(&probe).unwrap_err();
-        assert!(err.contains("文件不存在"));
+        assert!(err.contains("file does not exist"));
     }
 
     #[test]