refactor(CheckinDetailPage): 优化作业选择区域的编辑模式显示

在编辑模式下直接显示作业文本而非选择器，提升用户体验

@@ -18,15 +18,23 @@
             <div class="section-wrapper">
             <div class="section-wrapper">
                 <div class="section-title">提交作业</div>
                 <div class="section-title">提交作业</div>
                 <div class="section-content">
                 <div class="section-content">
-                    <!-- 作业弹框选择区域 -->
+                    <!-- 作业选择区域 -->
                     <div class="mb-4">
                     <div class="mb-4">
+                        <!-- 编辑模式下直接显示文本 -->
+                        <div v-if="isEditMode" class="bg-gray-50 rounded-lg p-3 border border-gray-100 flex items-center justify-between">
+                            <span class="text-gray-700 font-medium">当前作业</span>
+                            <span class="text-gray-900 font-bold">{{ selectedTaskText }}</span>
+                        </div>
+
+                        <!-- 非编辑模式下显示选择框 -->
+                        <template v-else>
                             <van-field v-model="selectedTaskText" is-link readonly label="选择作业" placeholder="请选择本次打卡的作业"
                             <van-field v-model="selectedTaskText" is-link readonly label="选择作业" placeholder="请选择本次打卡的作业"
-                            :disabled="isEditMode" @click="!isEditMode && (showTaskPicker = true)"
-                            class="rounded-lg border border-gray-100" />
+                                @click="showTaskPicker = true" class="rounded-lg border border-gray-100" />
                             <van-popup v-model:show="showTaskPicker" round position="bottom">
                             <van-popup v-model:show="showTaskPicker" round position="bottom">
                                 <van-picker v-model="selectedTaskValue" :columns="taskOptions" @cancel="showTaskPicker = false"
                                 <van-picker v-model="selectedTaskValue" :columns="taskOptions" @cancel="showTaskPicker = false"
                                 @confirm="onConfirmTask" />
                                 @confirm="onConfirmTask" />
                             </van-popup>
                             </van-popup>
+                        </template>
                     </div>
                     </div>
                     <!-- 计数对象 -->
                     <!-- 计数对象 -->
                     <div v-if="taskType === 'count' && selectedTaskValue && selectedTaskValue.length > 0" class="mb-4">
                     <div v-if="taskType === 'count' && selectedTaskValue && selectedTaskValue.length > 0" class="mb-4">