feat(签到组件): 添加签到功能及相关样式和逻辑

- 新增签到组件HTML模板和CSS样式
- 实现签到功能的核心逻辑和交互
- 添加签到日历和用户列表展示
- 支持签到规则查看和签到操作
- 集成API接口获取签到数据和提交签到

css/signIn.css

@@ -131,6 +131,20 @@ body {
   padding: 20px;
   border-radius: 0 0 20px 0;
 }
+.signInBox-mask .signInBox .signInBox-content .left-box .content-header .outer-ring::after {
+  content: "";
+  position: absolute;
+  top: 26px;
+  left: -11px;
+  width: 0;
+  height: 0;
+  transform: translateX(-50%);
+  border: 12px solid #000;
+  border-top-color: transparent;
+  border-bottom-color: transparent;
+  border-left-color: transparent;
+  border-right-color: #fdda55;
+}
 .signInBox-mask .signInBox .signInBox-content .left-box .content-header .outer-ring .rule-box {
   background-color: #fff;
   -moz-box-shadow: 0px 0px 3px rgba(0, 0, 0, 0.07058824);

css/signIn.less

@@ -149,6 +149,21 @@ body {
                         padding: 20px;
                         border-radius: 0 0 20px 0;
 
+                        &::after {
+                            content: "";
+                            position: absolute;
+                            top: 26px;
+                            left: -11px;
+                            width: 0;
+                            height: 0;
+                            transform: translateX(-50%);
+                            border: 12px solid #000;
+                            border-top-color: transparent;
+                            border-bottom-color: transparent;
+                            border-left-color: transparent;
+                            border-right-color: #fdda55;
+                        }
+
                         .rule-box {
                             background-color: #fff;
                             -moz-box-shadow: 0px 0px 3px rgba(0, 0, 0, 0.0705882352941176);