style(frontend): 表格操作列统一样式与确认框视觉收敛

- 新增 table-actions.css：操作列 flex 居中、间距交给 gap、破坏性动作前
  加分组竖线、链接按钮悬停加深并加下划线（默认浅靛蓝在表格底色上对比度
  不足）；包装 span 改 flex，消除行内盒基线导致的约 1.7px 垂直错位
- 11 个列表页操作列套用统一容器与分隔线，列宽按动作自然宽度调整并居中
- 确认框不再传 type:warning（Element Plus 的实心黄圆图标与正文并排成
  两列，标题行反被留空），图标改由全局样式画在标题行左侧，正文与标题
  文字左对齐；图标为 CSS 伪元素，不进无障碍树

验证：pnpm type-check 绿

Co-Authored-By: Claude Code <noreply@anthropic.com>

frontend/src/views/business/shipments/index.vue

@@ -337,10 +337,13 @@ onMounted(() => {
             <span class="cell-amount">{{ row.total_amount }}</span>
           </template>
         </el-table-column>
-        <el-table-column label="操作" width="130" fixed="right">
+        <el-table-column label="操作" width="130" fixed="right" align="center">
           <template #default="{ row }">
-            <el-button link type="primary" size="small" @click="openEdit(row)">编辑</el-button>
-            <el-button link type="danger" size="small" @click="handleDelete(row)">删除</el-button>
+            <div class="table-actions">
+              <el-button link type="primary" size="small" @click="openEdit(row)">编辑</el-button>
+              <span class="table-actions__divider" aria-hidden="true"></span>
+              <el-button link type="danger" size="small" @click="handleDelete(row)">删除</el-button>
+            </div>
           </template>
         </el-table-column>
       </el-table>