fix(web): 本地优先保存与 design 页体验修复

- 保存先写本地缓存，登录后可选云端同步；退出登录不再因文件操作跳转登录

- 修复 Layui 遮罩残留、design2 保存后线条、toast 被 finally 提前关闭

- 保存过程恢复 loading spinner；成功提示 2.5 秒

- 云端 payload 瘦身与体积超限提示；后端 schema 迁移与 FileService 容错

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend-web/pages/admin/assets/js/views/orders.js

@@ -4,6 +4,7 @@
   var Api = function () { return window.AdminApi; };
   var Ui = function () { return window.AdminUi; };
   var I = function () { return window.AdminI18n; };
+  var Form = function () { return window.AdminForm; };
   var State = function () { return window.AdminState; };
   var Filter = function () { return window.AdminFilter; };
   var Menu = function () { return window.AdminMenu; };
@@ -162,7 +163,7 @@
       '<div class="soon-form-field"><label class="soon-form-label">备注</label>' +
       '<textarea id="orderNote" class="soon-input soon-input--sm" rows="3" placeholder="' + I().esc(placeholder) +
       '"></textarea></div>' +
-      '<button type="button" class="soon-btn soon-btn--sm" id="adminModalSave">确认</button></div>';
+      Form().actions('确认', 'adminModalSave') + '</div>';
     Ui().openFormModal(title, form, function () {
       return onSave(Ui().el('orderNote').value.trim());
     });
@@ -246,7 +247,7 @@
         openNoteModal(title, '可选：填写审核备注', function (note) {
           return Api().postJson('orders/' + btn.dataset.id + '/refund/approve', { note: note }).then(function (r) {
             if (r) {
-              layer.closeAll();
+              soonLayerDismiss();
               var gw = r.data && r.data.gateway;
               var msg = '退款已完成';
               if (gw && gw.indexOf('skipped') === 0) msg += '（未配置支付密钥，仅标记退款并撤销会员）';
@@ -268,7 +269,7 @@
           }
           return Api().postJson('orders/' + btn.dataset.id + '/refund/reject', { note: note }).then(function (r) {
             if (r) {
-              layer.closeAll();
+              soonLayerDismiss();
               soonToast('已拒绝退款申请', 'success');
               Ui().closeDrawer();
               render();