perf(web): reuse locale formatters

vehicle-data-platform/apps/web/src/v2/pages/AccessPage.tsx

@@ -12,6 +12,7 @@ import { QUERY_MEMORY, queryScopeKey, retainPreviousPageWithinScope } from '../q
 import { downloadBlob } from '../domain/download';
 
 const PROTOCOLS = ['GB32960', 'JT808', 'YUTONG_MQTT'] as const;
+const compactAccessTimeFormatter = new Intl.DateTimeFormat('zh-CN', { month: '2-digit', day: '2-digit', hour: '2-digit', minute: '2-digit', hour12: false });
 const EMPTY_FILTERS = { keyword: '', protocol: '', oem: '', connectionState: '', onlineState: '', model: '', provider: '', firstSeenFrom: '', firstSeenTo: '', latestSeenFrom: '', latestSeenTo: '', delayState: '' };
 type Filters = typeof EMPTY_FILTERS;
 
@@ -27,7 +28,7 @@ function compactTime(value: string) {
   if (!value) return '—';
   const parsed = new Date(value);
   if (Number.isNaN(parsed.getTime())) return '—';
-  return new Intl.DateTimeFormat('zh-CN', { month: '2-digit', day: '2-digit', hour: '2-digit', minute: '2-digit', hour12: false }).format(parsed).replace(/\//g, '-');
+  return compactAccessTimeFormatter.format(parsed).replace(/\//g, '-');
 }
 
 function ProtocolState({ status, detailed = false }: { status?: AccessProtocolStatus; detailed?: boolean }) {

vehicle-data-platform/apps/web/src/v2/pages/HistoryPage.tsx

@@ -10,6 +10,8 @@ import { QUERY_MEMORY, retainPreviousPageWithinScope } from '../queryPolicy';
 import { usePlatformSession } from '../auth/AuthGate';
 import { canOperate } from '../auth/session';
 
+const historyAxisTimeFormatter = new Intl.DateTimeFormat('zh-CN', { timeZone: 'Asia/Shanghai', month: '2-digit', day: '2-digit', hour: '2-digit', minute: '2-digit', hour12: false });
+
 function HistoryTrend({ response, category, loading, error }: { response?: HistorySeriesResponse; category: string; loading: boolean; error?: string }) {
   const panels = useMemo(() => buildHistorySeriesPanels(response), [response]);
   if (category !== 'location') return <section className="v2-history-trend"><header><strong>聚合趋势</strong></header><div className="v2-history-chart-empty">{category === 'raw' ? '原始报文是离散证据，不生成可能误导的连续趋势；请使用明细与导出。' : '日里程按自然日展示，当前请使用明细表核对起止里程。'}</div></section>;
@@ -28,7 +30,7 @@ function HistoryTrend({ response, category, loading, error }: { response?: Histo
 export function formatAxisTime(value: string) {
   const parsed = new Date(value);
   if (!Number.isFinite(parsed.getTime())) return value.replace('T', ' ').slice(5, 16);
-  return new Intl.DateTimeFormat('zh-CN', { timeZone: 'Asia/Shanghai', month: '2-digit', day: '2-digit', hour: '2-digit', minute: '2-digit', hour12: false }).format(parsed).replace('/', '-');
+  return historyAxisTimeFormatter.format(parsed).replace('/', '-');
 }
 function currentHistoryWindow() {
   const now = new Date(); const pad = (value: number) => String(value).padStart(2, '0');

vehicle-data-platform/apps/web/src/v2/pages/StatisticsPage.tsx

@@ -5,6 +5,7 @@ import { useSearchParams } from 'react-router-dom';
 import { api } from '../../api/client';
 import type { DailyMileageRow, MileageStatistics, Page, VehicleRow } from '../../api/types';
 import { downloadMileageWorkbook } from '../domain/mileageExport';
+import { formatZhNumber } from '../domain/formatters';
 import { InlineError } from '../shared/AsyncState';
 import { QUERY_MEMORY, retainPreviousPageWithinScope } from '../queryPolicy';
 
@@ -41,7 +42,7 @@ function defaultWindow(days = 30) {
 
 function formatKm(value?: number) {
   if (value == null || !Number.isFinite(value)) return '—';
-  return new Intl.NumberFormat('zh-CN', { maximumFractionDigits: 1 }).format(value);
+  return formatZhNumber(value, 1);
 }
 
 function inclusiveDays(dateFrom: string, dateTo: string) {

vehicle-data-platform/apps/web/src/v2/pages/VehiclePage.tsx

@@ -11,15 +11,16 @@ import { usePlatformSession } from '../auth/AuthGate';
 import { canAdminister } from '../auth/session';
 import { QUERY_MEMORY } from '../queryPolicy';
 import { formatTelemetryTime, formatTelemetryValue, telemetryQualityLabel } from '../domain/telemetry';
+import { formatZhNumber } from '../domain/formatters';
 import { parseVehicleProfileSyncCSV, vehicleProfileSyncCSVHeader } from '../domain/profileSync';
 import { FleetMap } from '../map/FleetMap';
 import { InlineError, PageLoading } from '../shared/AsyncState';
 
 function fmt(value?: string) { return value?.trim() || '—'; }
-function metric(value: number | undefined, fallback = '—') { return typeof value === 'number' && Number.isFinite(value) ? new Intl.NumberFormat('zh-CN', { maximumFractionDigits: 1 }).format(value) : fallback; }
+function metric(value: number | undefined, fallback = '—') { return typeof value === 'number' && Number.isFinite(value) ? formatZhNumber(value, 1) : fallback; }
 function timeOnly(value?: string) { if (!value) return '—'; const parts = value.split(' '); return parts[parts.length - 1] || value; }
 function issueTone(issue: QualityIssueRow) { return issue.severity === 'error' ? 'error' : 'warning'; }
-function durationHours(seconds?: number | null) { return seconds == null ? '—' : `${new Intl.NumberFormat('zh-CN', { maximumFractionDigits: 1 }).format(seconds / 3600)} 小时`; }
+function durationHours(seconds?: number | null) { return seconds == null ? '—' : `${formatZhNumber(seconds / 3600, 1)} 小时`; }
 function localDateTime(value?: string) { return value ? value.slice(0, 16) : ''; }
 const operationStatusLabels = { unknown: '待维护', active: '运营中', inactive: '停运', maintenance: '维保中', retired: '已退役' } as const;