feat(08-05-interaction-pattern-unification): 统一前端交互与反馈模式

client/src/pages/user-management/UserImportDialog.tsx

@@ -1,3 +1,4 @@
+import { resolveErrorMessage as resolveUserErrorMessage } from "../../lib/resolveErrorMessage";
 import { useEffect, useState } from "react";
 import { useMutation } from "@tanstack/react-query";
 import {
@@ -6,7 +7,6 @@ import {
   type UserImportApplyResult,
   type UserImportDryRunResult,
 } from "../../api/users";
-import { mapApiErrorMessage } from "../../api/errorMessages";
 import { isApiError } from "../../api/types";
 import { downloadBlob } from "../../lib/download";
 import { Button } from "../../components/ui/button";
@@ -42,10 +42,7 @@ function toCsvCell(value: string) {
 }
 
 function formatErrorMessage(error: unknown, fallback: string) {
-  if (isApiError(error)) {
-    return `${error.code}: ${mapApiErrorMessage(error.code, error.details, error.message)}`;
-  }
-  return error instanceof Error ? error.message : fallback;
+  return resolveUserErrorMessage(error, fallback);
 }
 
 function parsePreviewFromError(error: unknown, sourceFilename: string): UserImportDryRunResult | null {