feat(ui): 添加进度条分隔线和分享按钮

- 在第二页面口感指数部分增加了虚线分隔线样式
- 新增进度条分隔线的样式细节调整
- 在首页引入分享功能配置，支持自定义分享标题和路径
- 添加侧边栏第三个徽章按钮，支持点击分享
- 设置分享按钮样式，确保位置和外观符合设计需求

src/pages/second/part4/index.vue

@@ -209,6 +209,7 @@ onMounted(() => {
                     <text class="progress-text">{{ item.label }}</text>
                 </view>
             </view>
+            <view class="progress-divider" />
             <view class="taste-section">
                 <text class="taste-label">口感指数</text>
                 <text class="taste-value">{{ completedCount * 25 }}%</text>
@@ -353,6 +354,12 @@ onMounted(() => {
     gap: 12rpx;
 }
 
+.progress-divider {
+    margin-top: 20rpx;
+    margin-bottom: 10rpx;
+    border-top: 5rpx dashed #C2D7E0;
+}
+
 .progress-item {
     display: flex;
     align-items: center;

src/pages/start/index.vue

 <script setup>
 import { ref } from 'vue';
+import { onShareAppMessage } from '@dcloudio/uni-app';
 
 // 图片路径
 const ASSETS = Object.freeze ({
@@ -97,6 +98,14 @@ const closeSidebar = () => {
     isSidebarExpanded.value = false;
   }
 };
+
+// 分享配置
+onShareAppMessage(() => {
+  return {
+    title: '滤芯排序游戏',
+    path: '/pages/start/index',
+  };
+});
 </script>
 
 <template>
@@ -149,6 +158,7 @@ const closeSidebar = () => {
       <view v-if="isSidebarExpanded" class="sidebar-custom-content">
         <view class="badge-nav-btn" @click.stop="navToBadgePage"></view>
         <view class="badge-nav-btn" @click.stop="navToCouponPage"></view>
+        <button class="badge-nav-btn badge-nav-btn-third" open-type="share" @click.stop></button>
       </view>
       <view class="sidebar-wrapper" @click.stop="toggleSidebar">
         <image 
@@ -378,6 +388,23 @@ const closeSidebar = () => {
       justify-content: center;
       align-items: center;
     }
+
+    .badge-nav-btn-third {
+      width: 170rpx;
+      height: 89rpx;
+      position: absolute;
+      top: 198rpx;
+      right: 0;
+      padding: 0;
+      margin: 0;
+      background: transparent;
+      border: none;
+      line-height: normal;
+
+      &::after {
+        border: none;
+      }
+    }
   }
   
   .sidebar-icon {