refactor(CheckinDetailPage): 优化计数对象选择界面样式和交互逻辑

- 将复选框列表改为标签式选择，提升视觉体验
- 简化选择逻辑，移除不必要的复选框引用处理
- 将"学校"字段标签改为更通用的"单位"

@@ -44,30 +44,31 @@
                             <van-button size="small" type="primary" plain icon="plus" @click="showAddTargetDialog = true" class="!h-7">添加</van-button>
                         </div>
 
-                        <div class="bg-gray-50 rounded-lg p-2 max-h-48 overflow-y-auto">
-                            <van-checkbox-group v-model="selectedTargets">
+                        <div class="bg-gray-50 rounded-lg p-2">
+                            <div class="flex flex-wrap gap-2">
                                 <template v-if="targetList.length > 0">
                                     <div
                                         v-for="(item, index) in targetList"
                                         :key="index"
-                                        class="flex items-center justify-between p-3 mb-2 bg-white rounded border border-gray-100 last:mb-0"
-                                        @click="toggleTarget(index)"
+                                        class="px-4 py-1.5 rounded-full text-sm transition-colors duration-200 border cursor-pointer select-none"
+                                        :style="selectedTargets.some(t => t.name === item.name) ? {
+                                            backgroundColor: '#4caf50',
+                                            color: '#ffffff',
+                                            borderColor: '#4caf50'
+                                        } : {
+                                            backgroundColor: '#ffffff',
+                                            color: '#4b5563',
+                                            borderColor: '#e5e7eb'
+                                        }"
+                                        @click="toggleTarget(item)"
                                     >
-                                        <div class="flex-1">
-                                            <div class="font-medium text-gray-800">{{ item.name }}</div>
-                                            <div class="text-xs text-gray-500 mt-0.5">{{ item.city }} | {{ item.school }}</div>
-                                        </div>
-                                        <van-checkbox
-                                            :name="item"
-                                            :ref="el => setCheckboxRef(el, index)"
-                                            @click.stop
-                                        />
+                                        {{ item.name }}
                                     </div>
                                 </template>
-                                <div v-else class="text-center py-4 text-gray-400 text-sm">
+                                <div v-else class="w-full text-center py-4 text-gray-400 text-sm">
                                     暂无计数对象，请点击上方添加按钮
                                 </div>
-                            </van-checkbox-group>
+                            </div>
                         </div>
                     </div>
 
@@ -94,12 +95,12 @@
                             />
                             <van-field
                                 v-model="newTargetForm.school"
-                                label="学校"
+                                label="单位"
                                 rows="2"
                                 autosize
                                 type="textarea"
                                 maxlength="50"
-                                placeholder="请输入所在学校"
+                                placeholder="请输入所在单位"
                             />
                         </div>
                     </van-dialog>
@@ -284,17 +285,12 @@ const newTargetForm = reactive({
     school: ''
 })
 
-const checkboxRefs = ref([])
-const setCheckboxRef = (el, index) => {
-    if (el) {
-        checkboxRefs.value[index] = el
-    }
-}
-
-const toggleTarget = (index) => {
-    const checkbox = checkboxRefs.value[index]
-    if (checkbox) {
-        checkbox.toggle()
+const toggleTarget = (item) => {
+    const index = selectedTargets.value.findIndex(t => t.name === item.name)
+    if (index > -1) {
+        selectedTargets.value.splice(index, 1)
+    } else {
+        selectedTargets.value.push(item)
     }
 }