fix: preserve turnover deep-link snapshots and clarify data status

src/modules/self-operated/turnoverPresentation.test.ts

@@ -1,7 +1,12 @@
 import { describe, expect, it } from 'vitest'
-import { turnoverChart, turnoverNumber, windowText } from './turnoverPresentation'
+import { turnoverChart, turnoverNumber, windowText, turnoverReasonsText } from './turnoverPresentation'
 import type { TurnoverCharts, TurnoverWindowMetric } from './turnoverTypes'
 describe('turnover honest precision and charts', () => {
+  it('explains missing samples and zero average stock without exposing internal statuses', () => {
+    expect(turnoverReasonsText(['INSUFFICIENT'])).toBe('合格日库存样本不足')
+    expect(turnoverReasonsText(['ZERO_AVERAGE_STOCK'])).toContain('每日观测未捕获存量')
+    expect(turnoverReasonsText(['INVENTORY_UNKNOWN_OR_STALE'])).toContain('已过期')
+  })
   it('keeps tiny positive values distinct from zero and unknown', () => {
     expect(turnoverNumber(0.000001)).toBe('<0.01')
     expect(turnoverNumber(0.01, 1)).toBe('<0.1')