fix: fix log page timestamp display and optimize AuthFiles layout

- Add formatUnixTimestamp utility to auto-detect timestamp precision (s/ms/μs/ns)
  - Fix incorrect file modification time display in logs page
  - Remove fixed height constraint from AuthFilesPage model list

src/pages/AuthFilesPage.module.scss

@@ -417,8 +417,6 @@
   display: flex;
   flex-direction: column;
   gap: $spacing-sm;
-  max-height: 400px;
-  overflow-y: auto;
 }
 
 .modelItem {

src/pages/LogsPage.tsx

@@ -7,6 +7,7 @@ import { ToggleSwitch } from '@/components/ui/ToggleSwitch';
 import { IconDownload, IconRefreshCw, IconTimer, IconTrash2 } from '@/components/ui/icons';
 import { useNotificationStore, useAuthStore } from '@/stores';
 import { logsApi } from '@/services/api/logs';
+import { formatUnixTimestamp } from '@/utils/format';
 import styles from './LogsPage.module.scss';
 
 interface ErrorLogItem {
@@ -629,7 +630,7 @@ export function LogsPage() {
                   <div className="item-title">{item.name}</div>
                   <div className="item-subtitle">
                     {item.size ? `${(item.size / 1024).toFixed(1)} KB` : ''}{' '}
-                    {item.modified ? new Date(item.modified).toLocaleString() : ''}
+                    {item.modified ? formatUnixTimestamp(item.modified) : ''}
                   </div>
                 </div>
                 <div className="item-actions">

src/utils/format.ts

@@ -52,6 +52,37 @@ export function formatDateTime(date: string | Date): string {
   });
 }
 
+/**
+ * 将 Unix 时间戳（秒/毫秒/微秒/纳秒）格式化为本地时间字符串
+ */
+export function formatUnixTimestamp(value: unknown, locale?: string): string {
+  if (value === null || value === undefined || value === '') return '';
+
+  const asNumber = typeof value === 'number' ? value : Number(value);
+  const date = (() => {
+    if (!Number.isFinite(asNumber) || Number.isNaN(asNumber)) {
+      return new Date(String(value));
+    }
+
+    const abs = Math.abs(asNumber);
+
+    // 秒：常见 10 位（~1e9）
+    if (abs < 1e11) return new Date(asNumber * 1000);
+
+    // 毫秒：常见 13 位（~1e12）
+    if (abs < 1e14) return new Date(asNumber);
+
+    // 微秒：常见 16 位（~1e15）
+    if (abs < 1e17) return new Date(Math.round(asNumber / 1000));
+
+    // 纳秒：常见 19 位（~1e18）
+    return new Date(Math.round(asNumber / 1e6));
+  })();
+
+  if (Number.isNaN(date.getTime())) return '';
+  return locale ? date.toLocaleString(locale) : date.toLocaleString();
+}
+
 /**
  * 格式化数字（添加千位分隔符）
  */