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/lib/i18n/en.ts

@@ -866,14 +866,23 @@ export const en: Catalog = {
       payments: "Payments",
       avgStay: "Avg stay",
       subscribers: "Subscribers",
+      peakOcc: "Peak occupancy",
+      voids: "Voided tickets",
+      anomalies: "Anomalies",
     },
     chart: {
       flow: "Entries & exits over time",
+      occupancy: "Occupancy — cars inside",
+      occupancySeries: "Cars inside",
       revenue: "Revenue ({{currency}})",
       mix: "Revenue mix",
-      peakHours: "Entries by hour of day",
+      stay: "Stay duration (closed sessions)",
+      heatmap: "Entries heatmap — hour × day",
       breakdown: "Breakdown",
     },
+    capacityLine: "capacity",
+    stay: { m: "m", h: "h" },
+    dowShort: ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"],
     mix: { ticket: "Transient", subSales: "Subscriptions", subWindow: "Out-of-window" },
     row: {
       cash: "Cash",