修复前后端显示异常问题（受试者、中心、负责人、日期等）

frontend/src/utils/display/index.ts

@@ -0,0 +1,45 @@
+/**
+ * 统一的显示适配层，避免直接暴露 ID / 枚举原值 / 原始时间。
+ */
+
+export const displayFallback = "—";
+
+export const displayEnum = (enumMap: Record<string, string>, value?: string | null) => {
+  if (!value) return displayFallback;
+  return enumMap[value] || displayFallback;
+};
+
+export const displayUser = (
+  userId?: string | null,
+  opts?: { users?: Record<string, string>; members?: Record<string, string> }
+) => {
+  if (!userId) return displayFallback;
+  const name =
+    opts?.users?.[userId] ||
+    opts?.members?.[userId] ||
+    // 兼容成员数据的 user_id 为 key 的情况
+    (opts?.members && Object.values(opts.members).find((_, k) => k === userId));
+  return (name as string) || displayFallback;
+};
+
+export const displayEntity = (entityMap: Record<string, string>, id?: string | null) => {
+  if (!id) return displayFallback;
+  return entityMap[id] || displayFallback;
+};
+
+export const displayDate = (value?: string | number | Date | null) => {
+  if (!value) return displayFallback;
+  const date = new Date(value);
+  if (isNaN(date.getTime())) return displayFallback;
+  return date.toISOString().slice(0, 10);
+};
+
+export const displayDateTime = (value?: string | number | Date | null) => {
+  if (!value) return displayFallback;
+  const date = new Date(value);
+  if (isNaN(date.getTime())) return displayFallback;
+  const pad = (n: number) => String(n).padStart(2, "0");
+  return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())} ${pad(date.getHours())}:${pad(
+    date.getMinutes()
+  )}`;
+};