fix: 修复邀请好友分享功能

- 使用button组件的open-type=share触发分享
- 移除uni.showShareMenu调用
- 添加button样式重置

xuan-deduct-uniapp/src/pages/mine/coins.vue

@@ -64,9 +64,9 @@
             <text class="task-reward">+10金币/人</text>
           </view>
         </view>
-        <view class="task-btn" @click="inviteFriend">
+        <button class="task-btn" open-type="share">
           <text class="task-btn-text">邀请</text>
-        </view>
+        </button>
       </view>
     </view>
     
@@ -238,12 +238,6 @@ export default {
       
       uni.showToast({ title: `签到成功 +${reward}金币`, icon: 'success' })
     },
-    inviteFriend() {
-      uni.showShareMenu({
-        withShareTicket: true,
-        menus: ['shareAppMessage']
-      })
-    },
     loadVideoCount() {
       const today = this.formatDate(new Date())
       const lastVideoDate = uni.getStorageSync('lastVideoDate')
@@ -550,6 +544,13 @@ page {
   background: linear-gradient(135deg, #10B981 0%, #059669 100%);
   padding: 16rpx 32rpx;
   border-radius: 32rpx;
+  border: none;
+  margin: 0;
+  line-height: normal;
+}
+
+.task-btn::after {
+  border: none;
 }
 
 .task-btn.disabled {