style(JlsBottomNav): 调整底部导航栏高度并移除边框

将底部导航栏的固定高度和最小高度统一调整为80px，移除顶部分割线，并优化内部项布局以更好地适配移动端和桌面端视图。

@@ -84,11 +84,11 @@ const navigate = (path) => {
   align-items: stretch;
   justify-content: space-around;
   box-sizing: border-box;
+  height: 80px;
   padding: 8px 12px;
   z-index: 50;
-  min-height: 66px;
+  min-height: 80px;
   background: rgba(255, 255, 255, 0.98);
-  border-top: 1px solid rgba(166, 121, 57, 0.12);
   backdrop-filter: blur(6px);
 }
 
@@ -109,7 +109,8 @@ const navigate = (path) => {
   flex-direction: column;
   align-items: center;
   justify-content: center;
-  min-height: 50px;
+  width: 100%;
+  height: 100%;
   gap: 5px;
   border-radius: 10px;
   color: #8b95a7;
@@ -147,12 +148,12 @@ const navigate = (path) => {
 
 @media screen and (min-width: 768px) {
   .bottom-nav {
-    min-height: 72px;
+    height: 80px;
+    min-height: 80px;
     padding: 8px 16px;
   }
 
   .nav-item-inner {
-    min-height: 56px;
     gap: 6px;
   }