优化页面、修复BUG

client/src/components/admin/SessionExpiredModal.vue

@@ -0,0 +1,26 @@
+<template>
+  <Teleport to="body">
+    <div
+      v-if="sessionExpired"
+      class="fixed inset-0 z-[9999] flex items-center justify-center bg-black/60 backdrop-blur-sm"
+    >
+      <div class="w-full max-w-sm mx-4 bg-[#121214] border border-white/10 rounded-xl p-6 shadow-2xl">
+        <h3 class="text-lg font-medium text-white mb-2">登录已过期</h3>
+        <p class="text-sm text-art-muted mb-6">您的登录状态已失效，请重新登录。</p>
+        <button
+          type="button"
+          class="w-full admin-btn-primary py-2.5"
+          @click="confirmSessionExpired"
+        >
+          确认
+        </button>
+      </div>
+    </div>
+  </Teleport>
+</template>
+
+<script setup lang="ts">
+import { useAuth } from '../../composables/useAuth'
+
+const { sessionExpired, confirmSessionExpired } = useAuth()
+</script>