feat(web): currency becomes a closed select (ALL / EUR / USD)

Currency was free text in the tariff editor (composer page + lab draft
modal — shared form) and the subscription plan editor; a typo could
publish an unknown code onto immutable versions. Both now offer a closed
select from lib/currencies.ts. An out-of-set code already stored on an
old record is appended as an extra option so it displays + round-trips
unchanged. Blank tariff form defaults to ALL (was EUR) — the site's
actual currency.

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

apps/web/src/SubscriptionPlansManager.tsx

@@ -14,6 +14,7 @@ import {
   type SubscriptionPlan,
 } from "./api.js";
 import { Modal } from "./ui/Modal.js";
+import { currencyOptions } from "./lib/currencies.js";
 
 // Admin-only subscription PLAN catalog. Plans are admin-composed, versioned config the
 // operator sells from (so the operator never types a price). Editing a plan PUBLISHES A
@@ -348,7 +349,11 @@ export function SubscriptionPlansManager() {
               <label className="label">{t("plans.pricePer")}</label>
               <span className="flex items-center gap-2">
                 <input className="input w-28" value={form.priceMajor} inputMode="decimal" onChange={(e) => setForm((f) => f && { ...f, priceMajor: e.target.value })} placeholder="e.g. 800" />
-                <input className="input w-16" value={form.currency} onChange={(e) => setForm((f) => f && { ...f, currency: e.target.value })} />
+                <select className="input w-auto" value={form.currency} onChange={(e) => setForm((f) => f && { ...f, currency: e.target.value })}>
+                  {currencyOptions(form.currency).map((c) => (
+                    <option key={c} value={c}>{c}</option>
+                  ))}
+                </select>
                 <span className="text-[0.75rem] text-term-muted">/ {t(PERIOD_KEY[form.period])}</span>
               </span>
             </div>

apps/web/src/TariffEditorForm.tsx

@@ -1,4 +1,5 @@
 import { useTranslation } from "react-i18next";
+import { currencyOptions } from "./lib/currencies.js";
 import {
   isTariffV2,
   type TariffBlock,
@@ -101,7 +102,7 @@ function emptyTier(): TierForm {
 
 export function emptyForm(): FormState {
   return {
-    currency: "EUR",
+    currency: "ALL",
     gracePeriodEntryMin: "15",
     incrementMin: "60",
     lostTicket: "20.00",
@@ -339,7 +340,11 @@ export function TariffEditorForm({
     <div>
       <div className="card card-body grid grid-cols-[max-content_1fr] items-center gap-x-4 gap-y-2">
         <label className="label">{t("tariff.currency")}</label>
-        <input className="input w-24" value={form.currency} onChange={(e) => set("currency", e.target.value)} maxLength={3} />
+        <select className="input w-24" value={form.currency} onChange={(e) => set("currency", e.target.value)}>
+          {currencyOptions(form.currency).map((c) => (
+            <option key={c} value={c}>{c}</option>
+          ))}
+        </select>
         <label className="label">{t("tariff.freeEntryGrace")}</label>
         <input className="input w-32" value={form.gracePeriodEntryMin} onChange={(e) => set("gracePeriodEntryMin", e.target.value)} />
         <label className="label">{t("tariff.billingIncrement")}</label>

apps/web/src/lib/currencies.ts

@@ -0,0 +1,11 @@
+// The currencies the booth can price in (ISO 4217). Money is always stored as
+// integer minor units + one of these codes; the UI offers a closed select rather
+// than free text so a typo can never publish an unknown currency.
+export const CURRENCIES = ["ALL", "EUR", "USD"] as const;
+
+/** The select options: the known set, plus the current value when it's some
+ *  historical code outside it (so an old record still displays + round-trips). */
+export function currencyOptions(current: string): string[] {
+  const cur = current.trim().toUpperCase();
+  return cur && !CURRENCIES.includes(cur as (typeof CURRENCIES)[number]) ? [...CURRENCIES, cur] : [...CURRENCIES];
+}