style: 统一输入框和选择器宽度为240px并优化卡片布局

- 将多处输入框和选择器的宽度从200px调整为240px
- 优化卡片布局结构，添加分割卡片提升可读性
- 移除部分冗余的刷新按钮和样式代码
- 调整日期选择器等表单元素的宽度为240px

seller/src/views/promotion/full-discount/full-discount.vue

@@ -3,10 +3,10 @@
     <Card>
       <Form ref="searchForm" :model="searchForm" inline :label-width="70" class="search-form">
         <Form-item label="活动名称">
-          <Input type="text" v-model="searchForm.promotionName" placeholder="请输入活动名称" clearable style="width: 200px" />
+          <Input type="text" v-model="searchForm.promotionName" placeholder="请输入活动名称" clearable style="width: 240px" />
         </Form-item>
         <Form-item label="活动状态" prop="promotionStatus">
-          <Select v-model="searchForm.promotionStatus" placeholder="请选择" clearable style="width: 200px">
+          <Select v-model="searchForm.promotionStatus" placeholder="请选择" clearable style="width: 240px">
             <Option value="NEW">未开始</Option>
             <Option value="START">已开始/上架</Option>
             <Option value="END">已结束/下架</Option>
@@ -14,7 +14,7 @@
           </Select>
         </Form-item>
         <Form-item label="活动时间">
-          <DatePicker v-model="selectDate" type="daterange" clearable placeholder="选择起始时间" style="width: 200px">
+          <DatePicker v-model="selectDate" type="daterange" clearable placeholder="选择起始时间" style="width: 240px">
           </DatePicker>
         </Form-item>
         <Form-item>
@@ -22,6 +22,8 @@
           <Button @click="handleReset" class="ml_10">重置</Button>
         </Form-item>
       </Form>
+    </Card>
+    <Card>  
       <Row class="operation">
         <Button type="primary" @click="newAct">新增</Button>
       </Row>