fix(样式): 修复移动端布局问题并优化样式

修复移动端搜索页面的布局问题，优化响应式设计
调整头部导航栏的z-index防止遮挡
统一处理签到组件的显示逻辑
修复搜索推荐框宽度问题
优化媒体查询断点设置

component/sign-in/sign-in.js

@@ -289,9 +289,11 @@ class SignInBox extends HTMLElement {
             signBtn.textContent = "今天已签到，明天记得来哦~";
             signBtn.classList.add("already");
 
-            const sign = document.querySelector(".sign-in");
-            sign.classList.add("sign-in-already");
-            sign.classList.remove("sign-in-no");
+            const sign = document.querySelectorAll(".sign-in");
+            sign.forEach((element) => {
+                element.classList.add("sign-in-already");
+                element.classList.remove("sign-in-no");
+            });
         });
     }