refactor(cycle-selection): 使用van-popup组件重构周期选择弹窗

移除手动计算弹窗尺寸的逻辑，改用vant组件内置的弹窗功能
添加自定义单选按钮样式，优化用户体验

 <template>
-  <div class="cycle-selection-page">
   <van-config-provider :theme-vars="themeVars">
-      <div class="cycle-popup">
+    <van-popup 
+      v-model:show="showPopup" 
+      position="center" 
+      :style="{ width: '85vw', maxWidth: '500px', borderRadius: '12px' }"
+      :close-on-click-overlay="false"
+    >
+      <div class="cycle-popup-content">
         <div class="popup-header">
           <h3>选择周期</h3>
         </div>
         <div class="popup-content">
-          <p style="padding-top: 0.85rem; text-align: justify;">{{ cycle_note }}</p>
+          <p class="cycle-note">{{ cycle_note }}</p>
           <van-radio-group v-model="selectedCycle">
             <div v-for="cycle in cycleList" :key="cycle.id" class="cycle-item">
               <van-radio :name="cycle.id">
+                <template #icon="{ checked }">
+                  <div class="custom-icon" :class="{ checked }">
+                    <van-icon name="success" v-if="checked" />
+                  </div>
+                </template>
                 <div class="cycle-info">
                   <div class="cycle-title">{{ cycle.title }}</div>
                   <div class="cycle-time">
@@ -25,17 +35,23 @@
           </van-radio-group>
         </div>
         <div class="popup-footer">
-          <van-button type="primary" class="confirm-btn" @click="confirmCycleSelection" :disabled="!selectedCycle">
+          <van-button 
+            type="primary" 
+            block 
+            round
+            @click="confirmCycleSelection" 
+            :disabled="!selectedCycle"
+          >
             确认选择
           </van-button>
         </div>
       </div>
+    </van-popup>
   </van-config-provider>
-  </div>
 </template>
 
 <script setup>
-import { ref, onMounted, nextTick, onUnmounted } from 'vue';
+import { ref, onMounted } from 'vue';
 import { useRouter, useRoute } from 'vue-router';
 import { getCycleListAPI } from '@/api/cycle';
 import { styleColor } from '@/constant.js';
@@ -57,74 +73,9 @@ const themeVars = {
 const cycleList = ref([]);
 const selectedCycle = ref('');
 const cycle_note = ref('');
+const showPopup = ref(false);
 
-/**
- * 动态设置弹框尺寸
- */
-const setPopupSize = () => {
-  nextTick(() => {
-    const popupElement = document.querySelector('.cycle-popup');
-    if (popupElement) {
-      const screenWidth = window.innerWidth;
-      const screenHeight = window.innerHeight;
-
-      // 设置宽度为屏幕的85%
-      const popupWidth = screenWidth * 0.85;
-      popupElement.style.width = `${popupWidth}px`;
-
-      // 根据屏幕尺寸动态计算最大宽度
-      let maxWidth;
-      if (screenWidth <= 480) {
-        // 小屏设备
-        maxWidth = screenWidth * 0.9;
-      } else if (screenWidth <= 768) {
-        // 中等屏幕设备
-        maxWidth = 420;
-      } else {
-        // 大屏设备
-        maxWidth = 500;
-      }
-
-      popupElement.style.maxWidth = `${maxWidth}px`;
-
-      // 设置高度为屏幕的70%
-      const popupHeight = screenHeight * 0.7;
-      popupElement.style.height = `${popupHeight}px`;
-
-      // 计算内容区域高度
-      calculatePopupContentHeight();
-    }
-  });
-};
-
-/**
- * 动态计算弹窗内容区域高度
- */
-const calculatePopupContentHeight = () => {
-  nextTick(() => {
-    const popupElement = document.querySelector('.cycle-popup');
-    const headerElement = document.querySelector('.popup-header');
-    const footerElement = document.querySelector('.popup-footer');
-    const contentElement = document.querySelector('.popup-content');
-
-    if (popupElement && headerElement && footerElement && contentElement) {
-      const popupHeight = popupElement.offsetHeight;
-      const headerHeight = headerElement.offsetHeight;
-      const footerHeight = footerElement.offsetHeight;
-      const padding = 40; // 上下padding的总和
-
-      const contentHeight = popupHeight - headerHeight - footerHeight - padding;
-      contentElement.style.height = `${contentHeight}px`;
-    }
-  });
-};
 
-/**
- * 窗口尺寸变化处理函数
- */
-const handleResize = () => {
-  setPopupSize();
-};
 
 /**
  * 获取周期列表
@@ -142,8 +93,8 @@ const getCycleList = async (form_code) => {
       // 设置周期列表
       cycleList.value = data.cycle_list;
       cycle_note.value = data.cycle_note;
-      // 设置弹框尺寸
-      setPopupSize();
+      // 显示弹框
+      showPopup.value = true;
     } else {
       // 如果不需要周期选择，检查未完成表单后跳转到目标页面
       const targetRoute = sessionStorage.getItem('cycle_target_route');
@@ -245,39 +196,14 @@ onMounted(() => {
     console.error('缺少表单代码参数');
     $router.replace('/');
   }
-
-  // 监听窗口尺寸变化
-  window.addEventListener('resize', handleResize);
-  // 监听屏幕方向变化
-  window.addEventListener('orientationchange', handleResize);
-});
-
-onUnmounted(() => {
-  // 清理事件监听器
-  window.removeEventListener('resize', handleResize);
-  window.removeEventListener('orientationchange', handleResize);
 });
 </script>
 
 <style lang="less">
-.cycle-selection-page {
-  width: 100vw;
-  height: 100vh;
-  background-color: rgba(0, 0, 0, 0.5);
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  .cycle-popup {
-    width: 85vw;
-    height: 70vh;
-    background: white;
-    border-radius: 12px;
+.cycle-popup-content {
   display: flex;
   flex-direction: column;
-    overflow: hidden;
-    position: relative;
-    margin: 0 auto;
-  }
+  max-height: 70vh;
   
   .popup-header {
     padding: 20px;
@@ -300,6 +226,14 @@ onUnmounted(() => {
     min-height: 0;
   }
 
+  .cycle-note {
+    padding-top: 0.85rem;
+    text-align: justify;
+    margin-bottom: 1rem;
+    color: #666;
+    line-height: 1.5;
+  }
+
   .cycle-item {
     padding: 15px 0;
     border-bottom: 1px solid #f5f5f5;
@@ -340,13 +274,21 @@ onUnmounted(() => {
     flex-shrink: 0;
   }
 
-  .confirm-btn {
-    width: 100%;
-    height: 44px;
-    border-radius: 8px;
-    font-size: 16px;
-    font-weight: 500;
+  .custom-icon {
+    width: 20px;
+    height: 20px;
+    border: 2px solid #ddd;
+    border-radius: 50%;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    transition: all 0.3s;
+
+    &.checked {
+      border-color: var(--van-radio-checked-icon-color);
+      background-color: var(--van-radio-checked-icon-color);
+      color: white;
+    }
   }
 }
-
 </style>