fix: format peer metrics with contracted units

src/lib/peer-metrics.test.ts

@@ -0,0 +1,21 @@
+import { describe, expect, it } from 'vitest';
+
+import { formatPeerMetric, peerMetricLabel } from './peer-metrics';
+
+describe('peer metric presentation', () => {
+  it('formats timing medians in milliseconds instead of percent', () => {
+    expect(formatPeerMetric('init_time_ms_p50', '1240')).toBe('۱٬۲۴۰ میلی‌ثانیه');
+    expect(formatPeerMetric('verify_time_ms_p95', '980')).toBe('۹۸۰ میلی‌ثانیه');
+  });
+
+  it('formats rate medians as percentages', () => {
+    expect(formatPeerMetric('payment_success_rate', '87.25')).toBe('۸۷٫۲۵٪');
+    expect(formatPeerMetric('paid_fee_rate', '0.5')).toBe('۰٫۵٪');
+  });
+
+  it('provides Persian labels for every contracted peer metric', () => {
+    expect(peerMetricLabel('payment_success_rate')).toBe('نرخ موفقیت پرداخت');
+    expect(peerMetricLabel('init_time_ms_p95')).toBe('زمان آغاز پرداخت — صدک ۹۵');
+    expect(peerMetricLabel('verify_time_ms_p50')).toBe('زمان تأیید — میانه');
+  });
+});