修正客户端费用换算信息空态

src/modules/first-leg/utils/inboundBilling.test.mjs

@@ -16,5 +16,12 @@ test('translates backend rounding modes into customer-facing calculation labels'
   assert.match(source, /export function getRoundingModeLabel/)
   assert.match(source, /CEILING: '向上取整'/)
   assert.match(source, /HALF_UP: '四舍五入'/)
-  assert.match(source, /return labels\[value\] \|\| value \|\| '-'/)
+  assert.match(source, /return value \? labels\[value\] \|\| value : '-'/)
+})
+
+test('renders conversion metadata as one complete label or a single empty marker', () => {
+  assert.match(source, /export function formatConversionPrecision/)
+  assert.match(source, /roundingScale === null \|\| roundingScale === undefined/)
+  assert.match(source, /\|\| !roundingMode\) return '-'/)
+  assert.match(source, /`系数 \$\{formatInboundNumber\(conversionFactor\)\} · 保留 \$\{roundingScale\} 位 \$\{getRoundingModeLabel\(roundingMode\)\}`/)
 })

src/modules/first-leg/utils/inboundBilling.ts

@@ -46,7 +46,7 @@ export function getTaxModeLabel(value: string) {
   return value || '-'
 }
 
-export function getRoundingModeLabel(value: string) {
+export function getRoundingModeLabel(value: string | null | undefined) {
   const labels: Record<string, string> = {
     UP: '向上舍入',
     DOWN: '向下舍入',
@@ -56,5 +56,16 @@ export function getRoundingModeLabel(value: string) {
     HALF_DOWN: '五舍六入',
     HALF_EVEN: '银行家舍入',
   }
-  return labels[value] || value || '-'
+  return value ? labels[value] || value : '-'
+}
+
+export function formatConversionPrecision(
+  conversionFactor: number | null | undefined,
+  roundingScale: number | null | undefined,
+  roundingMode: string | null | undefined,
+) {
+  if (conversionFactor === null || conversionFactor === undefined
+    || roundingScale === null || roundingScale === undefined
+    || !roundingMode) return '-'
+  return `系数 ${formatInboundNumber(conversionFactor)} · 保留 ${roundingScale} 位 ${getRoundingModeLabel(roundingMode)}`
 }