修复移动端层级问题

backend/server.js

@@ -212,7 +212,7 @@ class PixivServer {
    */
   start() {
     this.server = this.app.listen(this.port, () => {
-      logger.info('Pixiv 后端服务器已启动2');
+      logger.info('Pixiv 后端服务器已启动');
       logger.info(`服务地址: http://localhost:${this.port}`);
       logger.info(`健康检查: http://localhost:${this.port}/health`);
       logger.info(`登录状态: ${this.backend.isLoggedIn ? '已登录' : '未登录'}`);

ui/src/App.vue

@@ -165,7 +165,7 @@ onMounted(async () => {
   border-bottom: 1px solid #e5e7eb;
   position: sticky;
   top: 0;
-  z-index: 1002; /* 提高导航栏z-index，确保在所有元素之上 */
+  z-index: 1005; /* 提高导航栏z-index，确保在所有元素之上 */
 }
 
 .nav-container {
@@ -282,7 +282,6 @@ onMounted(async () => {
   opacity: 0;
   visibility: hidden;
   transition: all 0.3s ease;
-  z-index: 1001; /* 提高z-index，确保在小组件之上 */
 }
 
 .mobile-nav-menu.active {