style(ui): 统一全站 el-table 表头背景色及弹窗卡片化风格

- 将所有 el-table 表头背景色统一设为浅灰 #fafafa，覆盖普通表格、avue-crud 和固定列
- 移除业务组件内冗余的表头样式，改由全局样式统一控制
- 调整多处弹窗（预结算单、正式结算单、运输对账单、应收明细等）内容板块，改用全局 section-card 组件实现白底卡片分组
- 为多个弹窗内的搜索区域增加白底、圆角和阴影样式，提升视觉层次感
- 缩减多处表格“操作”列宽度以适配新布局
- 付款申请弹窗按钮由主色调 primary 改为 success，符合全站按钮风格规范
- 统一调整弹窗内表单、按钮、间距及背景细节，改善界面体验和视觉一致性

src/views/settlement/receivable-payable-detail.vue

@@ -76,7 +76,7 @@
             <span v-else>{{ formatColumnValue(row, column) }}</span>
           </template>
         </el-table-column>
-        <el-table-column label="操作" width="220" fixed="right" align="center">
+        <el-table-column label="操作" width="120" fixed="right" align="center">
           <template #default="{ row }">
             <div class="settlement-detail-page__actions">
               <el-link v-if="row.settlementStatus === 'pending'" type="primary" @click="openAdjustDialog(row)">
@@ -399,7 +399,13 @@
     </el-dialog>
 
     <el-dialog v-model="generateDialog.visible" title="生成费用" width="88%" append-to-body>
-      <el-form :model="generateQuery" inline label-position="right" label-width="120px">
+      <el-form
+        :model="generateQuery"
+        class="settlement-detail-page__generate-search"
+        inline
+        label-position="right"
+        label-width="120px"
+      >
         <el-form-item label="运单合同" required>
           <el-select
             v-model="generateQuery.contractId"
@@ -1329,10 +1335,17 @@ export default {
 }
 
 .settlement-detail-page__dialog-form {
-  padding: 16px 20px 0;
+  padding: 16px 20px;
+  background: #fff;
+  border-radius: 6px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
 
   :deep(.el-form-item) {
     margin-bottom: 16px;
+
+    &:last-child {
+      margin-bottom: 0;
+    }
   }
 
   :deep(.el-select) {
@@ -1340,8 +1353,24 @@ export default {
   }
 }
 
+.settlement-detail-page__adjust-toolbar {
+  margin-bottom: 8px;
+}
+
+.settlement-detail-page__generate-search {
+  margin-bottom: 16px;
+  padding: 12px 12px 4px;
+  background: #fff;
+  border-radius: 6px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
+}
+
 .settlement-detail-page__transfer-form {
   margin-bottom: 16px;
+  padding: 12px 12px 4px;
+  background: #fff;
+  border-radius: 6px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
 }
 
 @media screen and (max-width: 1200px) {
@@ -1355,4 +1384,17 @@ export default {
     grid-template-columns: 1fr;
   }
 }
+
+/* 详情弹窗 tabs 白底 */
+.settlement-detail-dialog {
+  :deep(.el-tabs__content) {
+    background: #fff;
+    padding: 16px;
+    border-radius: 0 0 6px 6px;
+  }
+
+  :deep(.el-tab-pane) {
+    background: transparent;
+  }
+}
 </style>