im聊天模块，我的群聊样式调整；通讯录页面优化处理；我的二维码样式重构；

pages/im/components/messageCell.vue

@@ -46,7 +46,7 @@
 <style lang="scss" scoped>
     .message--cell {
         display: flex;
-        padding: 20rpx 0 0 20rpx;
+        padding: 20rpx 10rpx 0 30rpx;
 
         .avatar {
             position: relative;
@@ -61,9 +61,10 @@
             box-sizing: border-box;
             position: relative;
             flex: 1;
+            
 
             border-bottom-width: 0.5px !important;
-            border-color: $u-border-color !important;
+            border-color: #f9f9f9 !important;
             border-bottom-style: solid;
 
             .header {
@@ -84,10 +85,12 @@
                 }
 
                 .time {
-                    font-size: $title-size-sm - 2;
+                    font-size: $title-size-sm - 3;
                     color: $text-gray-m;
                     position: absolute;
                     right: 30rpx;
+                    padding-top: 4rpx;
+                    font-weight: normal;
                 }
             }
         }