fix(after-sale): 前台售后不再展示「退款金额」字段

并非每次售后都真的退款——换货、补偿、仅作记录的情况都会把工单标成已完成，
此时退款金额要么是 0 要么没有实际意义，摆在前台只会让人误解钱已经退回去了。
两个前台入口都撤掉该字段：

- 售后详细弹窗：明细行只留「申请时间」，处理记录时间线不受影响
- 订单详情弹窗的售后记录卡片：撤掉退款金额后 meta 的 dl 会空壳，连同
  dl 一起移除；卡片仍保留状态徽章 + 申请时间 + 原因 + 「查看详细」

连带清理死代码：aftersaleAmountText / afterSaleAmount 两个格式化助手各自
只剩这一处调用，orders.css 里 5 条 .aksrt-order-detail__after-sale-meta
规则也随之无人引用。后台售后页与订单明细页的退款金额列不动——那边是运营
核对账目的口径，需要看到金额。

验证：tests/widget-system/ 462 项、tests/admin/ 76 项通过；抽取
buildDetailHtml 跑样例载荷，确认退款金额不再出现、申请时间 / 处理记录 /
再次申请售后按钮都还在。未做浏览器视觉验收。

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

@@ -533,12 +533,19 @@ test('frontend renders the handling log as a rope-knot timeline', () => {
   assert.match(js, /'<span class="aksrt-after-sale-timeline__knot"><\/span>'/)
   assert.match(js, /'<div class="aksrt-after-sale-timeline__head">' \+/)
   assert.match(js, /'<div class="aksrt-after-sale-timeline__body">';/)
+  // 退款金额不展示：并非每次售后都真的退款，工单被标完成也不代表把钱退回去了
+  assert.ok(!js.includes("detailRow('退款金额'"), 'after-sale detail modal must not show 退款金额')
+  assert.ok(!js.includes('aftersaleAmountText'), 'dead aftersaleAmountText must be removed')
+  assert.match(js, /detailRow\('申请时间', String\(latest\.created_at \|\| ''\)\)/)
 
-  // 订单详情弹窗：不再渲染售后状态节点进程，只保留状态徽章 + 原因 + 金额 + 「查看详细」；
+  // 订单详情弹窗：不再渲染售后状态节点进程与退款金额，只保留状态徽章 + 原因 + 「查看详细」；
   // 完整处理记录由点开的售后详细弹窗呈现，载荷仍带上 handling_log
   assert.ok(!center.includes('gatewayResultText'), 'dead gateway-result renderer must be removed')
   assert.ok(!center.includes('<dt>渠道结果</dt>'), 'dead 渠道结果 row must be removed')
   assert.ok(!center.includes('<dt>处理备注</dt>'), 'single 处理备注 row must be removed')
+  assert.ok(!center.includes('<dt>退款金额</dt>'), 'order detail card must not show 退款金额')
+  assert.ok(!center.includes('afterSaleAmount'), 'dead afterSaleAmount must be removed')
+  assert.ok(!center.includes('aksrt-order-detail__after-sale-meta'), 'empty meta dl must be removed')
   assert.ok(!center.includes('orderDetailHandlingLogHtml'), 'order detail modal must not render the timeline')
   assert.ok(!center.includes('AFTER_SALE_STATUS_LABELS'), 'order detail modal must not carry timeline labels')
   assert.ok(!center.includes('handlingEntryTitle'), 'order detail modal must not carry the timeline title helper')
@@ -555,6 +562,8 @@ test('frontend renders the handling log as a rope-knot timeline', () => {
   assert.match(css, /\.aksrt-after-sale-timeline__head \{ display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px; \}/)
   assert.match(css, /\.aksrt-after-sale-timeline__knot/)
   assert.match(css, /\.aksrt-after-sale-timeline__note/)
+  const ordersCss = read('assets/css/routes/orders.css')
+  assert.ok(!ordersCss.includes('aksrt-order-detail__after-sale-meta'), 'dead after-sale-meta rules must be removed')
   // 旧的两列结构（aside / main）已移除
   assert.ok(!css.includes('aksrt-after-sale-timeline__aside'), 'left-column aside must be removed')
   assert.ok(!css.includes('aksrt-after-sale-timeline__main'), 'right-column main must be removed')