Add per-event finance, event team permissions and public door sales state.

Event finance
- Finance tab on the event page: P&L summary with a revenue-to-result
  waterfall, costs and other income in one ledger, and the partner split
  with payouts. Lifecycle stepper (Selling, Adding costs, Ready to close,
  Finalized) with what is left to do; closing the books goes through a
  checklist dialog that freezes the numbers.
- Expense modal shows only the fields each calculation type needs, a live
  preview with the event's real counts, and a category suggested from the
  description. Date inputs follow the UI language.
- Global Finance page: profit per event with outliers clipped and labelled,
  and a "Ready to close" list of past events whose books are still open.
- Calculation service (integer PYG, basis points) with pinned regression
  scenarios; PYG formatting centralised in lib/money with locale-aware
  separators.

Event team permissions
- Per-event members with role presets and requireEventPermission; the
  header stat "Confirmed" is relabelled "Not checked in yet", which is
  what it counts.

Public sales state
- One sales state (online, door, sold out, ended, external, cancelled) for
  the event page, listings and JSON-LD, with the door price and tenders
  shown only while people can still pay at the door.

Frontend unit tests run with vitest (npm test in frontend/).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/lib/money.ts

@@ -0,0 +1,40 @@
+// The one place PYG amounts are formatted for admin screens (cards, tables,
+// charts, modal previews). PYG has no decimals. Separators follow the UI
+// language: English 2,470,000 PYG, Spanish 2.470.000 PYG. Grouping is done by
+// hand so it does not depend on the browser's locale data. Components use the
+// useMoney() hook (lib/useMoney.ts) to bind these to the active language.
+
+export type MoneyLocale = 'en' | 'es';
+
+const SEP: Record<MoneyLocale, { group: string; decimal: string }> = {
+  en: { group: ',', decimal: '.' },
+  es: { group: '.', decimal: ',' },
+};
+
+const sepFor = (locale: string) => SEP[locale === 'en' ? 'en' : 'es'];
+
+export function formatNumber(n: number, locale: string = 'es'): string {
+  const sign = n < 0 ? '-' : '';
+  return sign + Math.abs(Math.round(n)).toString().replace(/\B(?=(\d{3})+(?!\d))/g, sepFor(locale).group);
+}
+
+export function formatPyg(n: number, locale: string = 'es'): string {
+  return `${formatNumber(n, locale)} PYG`;
+}
+
+/** Axis labels: 2.470.000 -> 2,5M (es) / 2.5M (en); 850.000 -> 850k. */
+export function formatPygShort(n: number, locale: string = 'es'): string {
+  const abs = Math.abs(n);
+  const sign = n < 0 ? '-' : '';
+  if (abs >= 1_000_000) {
+    return `${sign}${(abs / 1_000_000).toFixed(abs >= 10_000_000 ? 0 : 1).replace('.', sepFor(locale).decimal)}M`;
+  }
+  if (abs >= 1_000) return `${sign}${Math.round(abs / 1_000)}k`;
+  return `${sign}${abs}`;
+}
+
+/** Basis points as a percent string: 290 -> "2.9%" (en) / "2,9%" (es). */
+export function formatPercent(bp: number, locale: string = 'es'): string {
+  const v = Math.round(bp) / 100;
+  return `${String(v).replace('.', sepFor(locale).decimal)}%`;
+}