feat(subs): scannable out-of-window slip + two-step booth flow

The advisory out-of-window slip for a subscriber had two problems:

1. Faulty character codes. It rendered via the generic text printReport,
   which has no CP852 mapping for the em dash, ellipsis, or warning sign in
   the composed strings — so they printed as "?" ("PARKIM ? JASHTE ORARIT").
   Added ASCII transliterations for that typographic punctuation in the
   ESC/POS encoder (— → -, ⚠ → !, … → ..., curly quotes/bullet), so they
   degrade to a readable glyph instead of "?".

2. Not scannable. The slip printed only "Nr: SUBSESS-…" as plain text, so
   the operator had to hand-key it. Gave the notice its own render function
   (renderWindowChargeNotice) + a printWindowChargeNotice device method that
   prints the occurrence id as a Code128 AND a QR — the same scan path as a
   transient ticket, so the operator scans it straight into the booth pay
   modal, which then quotes the combined window charge. Implemented on both
   the rongta and cashino drivers.

Also fixed the booth pay modal: "Open barrier" no longer shows by default
for a subscriber. A prepaid subscriber with nothing owed sees only a small
"assist open" reveal (the audited manual open for a faulty reader / lost
card stays available, just not the default). A subscriber owing an
out-of-window charge is now two steps — take payment first, then "Open
barrier" appears — instead of an always-on open button.

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

apps/web/src/lib/i18n/sq.ts

@@ -719,8 +719,11 @@ export const sq = {
     plan: "Plani",
     prepaid: "I PARAPAGUAR",
     subAssistHint: "Abonim i parapaguar. Hap barrierën për të ndihmuar daljen (lexues me defekt / kartë e munguar). S'ka pagesë.",
+    assistOpenReveal: "Ndihmë për hapje (lexues me defekt / kartë e humbur)…",
+    payWindowCharge: "Merr pagesën",
+    windowPaidHint: "Pagesa jashtë orarit u krye. Hap barrierën që abonenti të dalë.",
     windowCharge: "JASHTË ORARIT",
-    windowChargeHint: "Ky abonent parkoi jashtë orarit të lejuar të planit. Detyrohet të paguajë tarifën kalimtare për kohën jashtë orarit — merr pagesën për të lejuar daljen.",
+    windowChargeHint: "Ky abonent parkoi jashtë orarit të lejuar të planit. Detyrohet të paguajë tarifën kalimtare për kohën jashtë orarit — merr pagesën, pastaj hap barrierën.",
     subBarrierOpened: "Barriera u hap për abonentin (ndërhyrje e regjistruar).",
     voucherPrinted: "Bileta e daljes u printua në {{printer}}. Klienti del vetë te dalja.",
     // payment receipt (transparency slip)