Chore: Upgrade to Angular v18

Chore: Upgrade to Python 3.12
Chore: Upgrade to psycopg3

bookie/src/app/sales/bills/bill.resolver.ts

@@ -0,0 +1,22 @@
+import { inject } from '@angular/core';
+import { ResolveFn } from '@angular/router';
+
+import { Bill } from './bill';
+import { VoucherService } from './voucher.service';
+
+export const billResolver: ResolveFn<Bill> = (route) => {
+  const tableId = route.queryParamMap.get('table');
+  const guestId = route.queryParamMap.get('guest');
+  const voucherId = route.queryParamMap.get('voucher');
+  const billId = route.queryParamMap.get('bill');
+  if (billId !== null) {
+    return inject(VoucherService).getFromBill(billId);
+  }
+  if (tableId !== null) {
+    return inject(VoucherService).getFromTable(tableId as string, voucherId, guestId);
+  }
+  if (voucherId !== null) {
+    return inject(VoucherService).getFromId(voucherId);
+  }
+  throw new Error('Unable to get bill');
+};