fix(payment): 售后弹窗滚动容器改用 no-scrollbar，消除弹窗边缘滚动栏

mini-scrollbar 是 3px 可见细滚动条（举报弹窗 600px 宽弹窗用的写法）；
modal-mini 这类带炫彩横幅的表单弹窗，主题统一走禁封申诉/记录弹窗的口径：
scroll-y + no-scrollbar 完全隐藏滚动条（含细滚动条）+ 50vh 内层滚动。
申请与售后详细两个滚动容器一并切换，滚动行为不变、只是不再露出滚动栏。

assets/js/order-after-sale.js

@@ -115,7 +115,8 @@
     var html = '<div class="aksrt-after-sale-apply-modal">';
     html += colorfulHeader('申请售后', 'fa-undo-alt');
     html += '<form class="aksrt-after-sale-form" data-aksrt-after-sale-order="' + escapeHtml((order && order.order_number) || '') + '" novalidate>';
-    html += '<div class="scroll-y mini-scrollbar max-vh5">';
+    // 滚动容器与禁封申诉弹窗一致：no-scrollbar 完全隐藏滚动条（含细滚动条）+ 50vh 内层滚动。
+    html += '<div class="scroll-y no-scrollbar max-vh5">';
     html += orderSummaryHtml(order);
 
     if (reasons.length) {
@@ -174,7 +175,7 @@
 
     var html = '<div class="aksrt-after-sale-detail-modal">';
     html += colorfulHeader('售后详细', 'fa-clipboard-list');
-    html += '<div class="scroll-y mini-scrollbar max-vh5 aksrt-after-sale-detail__body">';
+    html += '<div class="scroll-y no-scrollbar max-vh5 aksrt-after-sale-detail__body">';
     html += orderSummaryHtml(order);
 
     html += '<div class="aksrt-after-sale-detail__statusRow">' +

tests/widget-system/after-sale-policy-contract.test.cjs

@@ -253,6 +253,12 @@ test('frontend after-sale modals are standalone and config-driven', () => {
   assert.match(js, /modal-colorful-header colorful-bg jb-blue/)
   assert.match(js, /AksrtModalRuntime\.open\(\{/)
 
+  // 滚动容器与禁封申诉弹窗同口径：no-scrollbar 完全隐藏滚动条（含细滚动条），
+  // 避免 modal-mini 弹窗边缘出现可见滚动栏。
+  assert.match(js, /'<div class="scroll-y no-scrollbar max-vh5">'/)
+  assert.match(js, /'<div class="scroll-y no-scrollbar max-vh5 aksrt-after-sale-detail__body">'/)
+  assert.ok(!js.includes('mini-scrollbar'), 'after-sale modals must not render a visible scrollbar')
+
   // 申请表单：预置原因徽章、所需资料、必填申请说明（placeholder 取后台配置）
   assert.match(js, /reasonOptions\(\)/)
   assert.match(js, /materialOptions\(\)/)