feat(booth): payment receipt / exit voucher — transparency slip + CP852 fixes

After a completed payment the customer always gets a transparency record:
entry time, payment time, duration parked, amount + tender. One shared
ESC/POS renderer (renderReceipt + ReceiptData in @parking/devices), two
modes: VOUCHER = those figures PLUS the scannable Code128 barcode and an
emphasised walk-back-grace line, so the one slip both proves payment and
self-exits at a distant exit reader (replaced the old barcode-only voucher);
STANDALONE = detail-only, auto-printed at payment when no voucher is issued.
Figures fold from the SIGNED ledger (latest payment event); printed on the
booth printer (failover to dispenser). Best-effort: a printer fault never
blocks the exit that already happened — the modal shows a note and offers
"Reprint receipt".

Server: booth-print.ts printPaymentReceipt() + receiptFigures(); routes
POST /api/voucher (voucher) + new POST /api/receipt (standalone/reprint).
Both ESC/POS drivers gained printReceipt(). Web: BoothPayModal auto-prints
after a non-voucher payment + reprint button; api.ts printReceipt().

CP852 fixes found on a real printout: (1) uppercase Ë was mapped to 0xEB
(that's ű) — correct byte is 0xD3; (2) Intl.NumberFormat injects a NO-BREAK
SPACE (U+00A0/U+202F) that isn't in CP852 and printed as "?" — line() now
normalises it to a plain space ("1000 Lekë"); (3) grace line wrapped
mid-word — split into two short lines.

Full build green; both receipt modes render-verified; routes live.

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

packages/devices/src/drivers/printer-rongta.ts

@@ -13,6 +13,7 @@ import type { ConfigField, DeviceConfig, PrinterDriver } from "../registry.js";
 import { hostField, portField, stubLog } from "./common.js";
 import {
   probe,
+  renderReceipt,
   renderReport,
   renderSubscriptionCard,
   renderTicket,
@@ -177,6 +178,14 @@ class RongtaPrinter implements PrinterDevice, MonitorableDevice {
     stubLog(this.driverId, `printed subscription card ${data.code}`);
   }
 
+  async printReceipt(data: import("../interfaces.js").ReceiptData): Promise<void> {
+    await sendRaw(this.#host, this.#port, renderReceipt(data), this.#timeout);
+    stubLog(
+      this.driverId,
+      `printed ${data.voucher ? "voucher" : "receipt"} ${data.ticketId}`,
+    );
+  }
+
   /**
    * Live operator-actionable status, scraped from the device's own status page.
    * The board decodes the ESC/POS status bits itself, so we trust its Yes/No