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

wiki/entities/rongta-printer.md

@@ -51,6 +51,21 @@ dependency — plus the code as text + holder/validity. Used for the auto-printe
 subscription card. (Verified: the `GS ( k` store/print byte sequences + the embedded code appear on
 the wire against a TCP capture.)
 
+**`printReceipt(ReceiptData)`** (added 2026-06-18) — the payment receipt / exit voucher
+([[booth-exit-flow]]). Same ESC/POS preamble; figures + amount, optional Code128 + grace.
+
+### CP852 codepage — two gotchas found on a real misprint (2026-06-18)
+The driver selects **CP852** (Latin-2) via `ESC t 18` and maps the Albanian letters to their CP852
+bytes. A printed voucher surfaced two encoding bugs, both now fixed in `printer-escpos.ts`:
+- **Uppercase `Ë` was mapped to `0xEB` — wrong.** In CP852 `0xEB` is `ű`; the correct byte for
+  `Ë` (U+00CB) is **`0xD3`**. The title `BILETË DALJE` / `FATURË PAGESE` printed garbled until fixed.
+  (Lowercase `ë` = `0x89` was always correct.) Anyone extending the CP852 map must verify bytes
+  against the actual Unicode.org `CP852.TXT`, not guess.
+- **`Intl.NumberFormat` injects a NO-BREAK SPACE.** Formatting `ALL` money yields `"1000 Lekë"`
+  (separator = U+00A0, sometimes U+202F narrow NBSP) — neither is in CP852, so it printed as `1000?Lekë`.
+  `line()` now normalises U+00A0/U+202F → a plain space before encoding. Any Intl-formatted value on a
+  ticket is affected, not just money.
+
 ## Status
 
 Driver written and compiles; entry-ticket layout is a first pass; live status monitoring is