feat(reports): occupancy curve, hour×dow heatmap, stay histogram, fraud KPIs

The dashboard had generic BI views but nothing parking-shaped. Added:

- Occupancy step-area over the range with the configured capacity as a
  red reference line. occupancyStart folds the ENTIRE prior ledger
  (voided entries excluded, clamped ≥0); each series point carries
  occupancyEnd. Answers "when are we near full".
- Entries heatmap hour × day-of-week (7×24, row 0 = Monday, site tz) as
  a pure CSS-grid intensity map — weekday-vs-weekend at a glance, the
  direct evidence for tariff windows. Replaces the flat hour histogram
  (strictly contains it).
- Stay-duration histogram at tariff-shaped edges (30m/1h/2h/4h/8h/24h/
  tail): where ladder/up-to breakpoints should sit.
- Voids + anomalies KPIs (accented when >0) — the look-closer counters
  the signed chain exists for; peak-occupancy KPI (peak / capacity).
- Revenue bars stacked cash vs card (the drawer's money vs the bank's);
  CSV export gains cash, card, occupancy_end columns.

Internals: localParts caches its Intl formatter per tz (was one new
formatter per ledger row); @parking/db re-exports lt/gt. 5 new tests.

Claude-Session: https://claude.ai/code/session_01Xcm6ikLgGoCxxHrxtjkk5V

apps/web/src/api.ts

@@ -483,7 +483,11 @@ export interface ReportSeriesPoint {
   entries: number;
   exits: number;
   revenueMinor: number;
+  cashMinor: number;
+  cardMinor: number;
   payments: number;
+  /** Cars inside at the END of the bucket. */
+  occupancyEnd: number;
 }
 
 export interface ReportTotals {
@@ -500,6 +504,8 @@ export interface ReportTotals {
   totalParkedMinutes: number;
   avgParkedMinutes: number;
   medianParkedMinutes: number;
+  voids: number;
+  anomalies: number;
 }
 
 export interface ReportSubscriptionStats {
@@ -519,6 +525,12 @@ export interface ReportSummary {
   totals: ReportTotals;
   series: ReportSeriesPoint[];
   entriesByHour: number[];
+  /** 7×24, row 0 = Monday — entries heatmap (weekday-vs-weekend patterns). */
+  entriesByDowHour: number[][];
+  /** Stay-duration histogram; last bucket has uptoMin null (>24h tail). */
+  stayHistogram: { uptoMin: number | null; count: number }[];
+  occupancyStart: number;
+  capacity: number | null;
   subscriptions: ReportSubscriptionStats;
 }