sirius-x: price mode is a USD / BCH toggle, not a dropdown

Two choices do not need a select: a segmented control shows both options at
once, the active one is obvious, and the explanation moves to a short hint
beside it. Arrow keys switch it like a radio group.

i18n/de.json

@@ -611,7 +611,7 @@
   "Sirius.X hosting — free, on Sia storage": "Sirius.X-Hosting — kostenlos, auf Sia-Speicher",
   "Another Sia folder (advanced)": "Anderer Sia-Ordner (erweitert)",
   "Price is fixed in": "Preis festgelegt in",
-  "US dollars — the BCH amount follows the market": "US-Dollar — der BCH-Betrag folgt dem Markt",
-  "BCH — the dollar value follows the market": "BCH — der Dollarwert folgt dem Markt",
+  "The BCH amount follows the market": "Der BCH-Betrag folgt dem Markt",
+  "The dollar value follows the market": "Der Dollarwert folgt dem Markt",
   "Accept between": "Akzeptiere zwischen"
 }

i18n/el.json

@@ -611,7 +611,7 @@
   "Sirius.X hosting — free, on Sia storage": "Φιλοξενία Sirius.X — δωρεάν, στον αποθηκευτικό χώρο Sia",
   "Another Sia folder (advanced)": "Άλλος φάκελος Sia (για προχωρημένους)",
   "Price is fixed in": "Η τιμή είναι σταθερή σε",
-  "US dollars — the BCH amount follows the market": "Δολάρια ΗΠΑ — το ποσό σε BCH ακολουθεί την αγορά",
-  "BCH — the dollar value follows the market": "BCH — η αξία σε δολάρια ακολουθεί την αγορά",
+  "The BCH amount follows the market": "Το ποσό σε BCH ακολουθεί την αγορά",
+  "The dollar value follows the market": "Η αξία σε δολάρια ακολουθεί την αγορά",
   "Accept between": "Αποδοχή μεταξύ"
 }

i18n/es.json

@@ -611,7 +611,7 @@
   "Sirius.X hosting — free, on Sia storage": "Alojamiento Sirius.X — gratis, en almacenamiento Sia",
   "Another Sia folder (advanced)": "Otra carpeta de Sia (avanzado)",
   "Price is fixed in": "El precio se fija en",
-  "US dollars — the BCH amount follows the market": "Dólares — la cantidad en BCH sigue al mercado",
-  "BCH — the dollar value follows the market": "BCH — el valor en dólares sigue al mercado",
+  "The BCH amount follows the market": "La cantidad en BCH sigue al mercado",
+  "The dollar value follows the market": "El valor en dólares sigue al mercado",
   "Accept between": "Aceptar entre"
 }

i18n/fr.json

@@ -611,7 +611,7 @@
   "Sirius.X hosting — free, on Sia storage": "Hébergement Sirius.X — gratuit, sur le stockage Sia",
   "Another Sia folder (advanced)": "Un autre dossier Sia (avancé)",
   "Price is fixed in": "Le prix est fixé en",
-  "US dollars — the BCH amount follows the market": "Dollars US — le montant en BCH suit le marché",
-  "BCH — the dollar value follows the market": "BCH — la valeur en dollars suit le marché",
+  "The BCH amount follows the market": "Le montant en BCH suit le marché",
+  "The dollar value follows the market": "La valeur en dollars suit le marché",
   "Accept between": "Accepter entre"
 }

i18n/pt.json

@@ -611,7 +611,7 @@
   "Sirius.X hosting — free, on Sia storage": "Alojamento Sirius.X — grátis, no armazenamento Sia",
   "Another Sia folder (advanced)": "Outra pasta Sia (avançado)",
   "Price is fixed in": "O preço é fixado em",
-  "US dollars — the BCH amount follows the market": "Dólares — o montante em BCH segue o mercado",
-  "BCH — the dollar value follows the market": "BCH — o valor em dólares segue o mercado",
+  "The BCH amount follows the market": "O montante em BCH segue o mercado",
+  "The dollar value follows the market": "O valor em dólares segue o mercado",
   "Accept between": "Aceitar entre"
 }

i18n/ru.json

@@ -611,7 +611,7 @@
   "Sirius.X hosting — free, on Sia storage": "Хостинг Sirius.X — бесплатно, в хранилище Sia",
   "Another Sia folder (advanced)": "Другая папка Sia (для опытных)",
   "Price is fixed in": "Цена зафиксирована в",
-  "US dollars — the BCH amount follows the market": "Доллары США — сумма в BCH следует за рынком",
-  "BCH — the dollar value follows the market": "BCH — долларовая стоимость следует за рынком",
+  "The BCH amount follows the market": "Сумма в BCH следует за рынком",
+  "The dollar value follows the market": "Долларовая стоимость следует за рынком",
   "Accept between": "Принимать в диапазоне"
 }

js/dashboard.js

@@ -685,7 +685,16 @@ async function signedHeaders(msg) {
 // ---------- sell (marketplace listing) ----------
 const RATE = () => window.siriusPricing?.CHIPNET_SATS_PER_USD || 250000;
 let activeListing = null;
-function sellMode() { return $("sell-mode").value; }
+function sellMode() { return $("sell-mode").dataset.value || "usd"; }
+function setSellMode(mode) {
+  $("sell-mode").dataset.value = mode;
+  for (const b of $("sell-mode").querySelectorAll("button")) {
+    const on = b.dataset.mode === mode;
+    b.classList.toggle("active", on); b.setAttribute("aria-checked", on ? "true" : "false");
+  }
+  $("sell-mode-hint").textContent = mode === "usd" ? "The BCH amount follows the market" : "The dollar value follows the market";
+  paintSellMode();
+}
 function paintSellMode() {
   const usd = sellMode() === "usd";
   $("sell-usd-terms").classList.toggle("hidden", !usd);
@@ -699,7 +708,11 @@ function paintBand() {
     ? `% of today's rate: you will receive between ${fmtBch(Math.round(sats * (1 - band / 100)))} and ${fmtBch(Math.round(sats * (1 + band / 100)))}`
     : "% of today's BCH rate";
 }
-$("sell-mode").addEventListener("change", paintSellMode);
+$("sell-mode").addEventListener("click", (e) => { const b = e.target.closest("button[data-mode]"); if (b) setSellMode(b.dataset.mode); });
+$("sell-mode").addEventListener("keydown", (e) => {
+  if (e.key !== "ArrowLeft" && e.key !== "ArrowRight") return;
+  e.preventDefault(); setSellMode(sellMode() === "usd" ? "bch" : "usd"); $("sell-mode").querySelector("button.active").focus();
+});
 $("sell-band").addEventListener("input", paintBand);
 function paintSell() {
   const st = $("sell-status");

js/i18n.js

@@ -22,7 +22,7 @@
 (function () {
   var STORE = "sirius-lang";
   var CACHE = "sirius-i18n:";
-  var VERSION = "20260920g"; // bump when dictionaries change
+  var VERSION = "20260920h"; // bump when dictionaries change
   var LANGS = {
     en: "English",
     de: "Deutsch",

portal.html

@@ -223,6 +223,14 @@
   .toggle .txt b{display:block;font-weight:600;font-size:14px}
   .toggle .txt span{color:var(--mut);font-size:12.5px}
   .toggle input[type=checkbox]{width:18px;height:18px;margin-top:3px;accent-color:var(--acid);flex:none}
+  .seg{display:inline-flex;align-items:center;gap:0;flex-wrap:wrap}
+  .seg button{font:inherit;font-size:13px;font-weight:600;letter-spacing:.02em;padding:7px 16px;cursor:pointer;background:rgba(255,255,255,.04);color:var(--mut);border:1px solid var(--line);margin-left:-1px;transition:background .12s,color .12s}
+  .seg button:first-child{border-radius:8px 0 0 8px;margin-left:0}
+  .seg button:last-of-type{border-radius:0 8px 8px 0}
+  .seg button:hover{color:var(--ink)}
+  .seg button.active{background:var(--acid);color:#0b0d10;border-color:var(--acid);position:relative;z-index:1}
+  .seg button:focus-visible{outline:2px solid var(--acid);outline-offset:2px;z-index:2}
+  .seg .dim{margin-left:12px}
   .pill{display:inline-block;font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;padding:2px 8px;border-radius:999px;background:rgba(255,255,255,.06);color:var(--dim);margin-left:8px;vertical-align:middle}
 
   /* modals kept for policy editing */
@@ -259,7 +267,7 @@
     .addrow{grid-template-columns:1fr 1fr}
   }
 </style>
-<script src="./js/i18n.js?v=20260920g"></script>
+<script src="./js/i18n.js?v=20260920h"></script>
 </head>
 <body>
 
@@ -360,11 +368,12 @@
           <p class="hint">You sign an offer once: "whoever pays me this price gets the certificate". The offer is stored by the gateway and shown on the <a href="./market" target="_blank" rel="noopener">market</a>. A buyer completes it in one transaction — you are paid in the same transaction that moves the name, or not at all. No escrow, nothing to trust.</p>
           <div class="status" id="sell-status">Checking the market…</div>
           <div id="sell-form">
-            <label style="margin-top:0">Price is fixed in</label>
-            <select id="sell-mode" style="max-width:360px">
-              <option value="usd">US dollars — the BCH amount follows the market</option>
-              <option value="bch">BCH — the dollar value follows the market</option>
-            </select>
+            <label style="margin-top:0" id="sell-mode-label">Price is fixed in</label>
+            <div class="seg" id="sell-mode" role="radiogroup" aria-labelledby="sell-mode-label" data-value="usd">
+              <button type="button" role="radio" aria-checked="true" data-mode="usd" class="active">USD</button>
+              <button type="button" role="radio" aria-checked="false" data-mode="bch">BCH</button>
+              <span class="dim" id="sell-mode-hint">The BCH amount follows the market</span>
+            </div>
             <div class="row" style="align-items:flex-end">
               <div><label style="margin-top:0">Price (USD)</label><input type="text" id="sell-usd" placeholder="25" inputmode="decimal" style="max-width:160px"></div>
               <div><label style="margin-top:0">Price (BCH)</label><input type="text" id="sell-bch" placeholder="0.0625" inputmode="decimal" style="max-width:200px"></div>
@@ -694,7 +703,7 @@
 <script src="./js/session.js?v=20260917dash"></script>
 <script src="./js/pin-escrow.js?v=20260909pin"></script>
 <script src="./js/pricing.js?v=20260920bits"></script>
-<script type="module" src="./js/dashboard.js?v=20260920usd2"></script>
+<script type="module" src="./js/dashboard.js?v=20260920usd3"></script>
 <script defer src="./js/theme.js?v=20260920compact"></script>
 <script defer src="./js/site-footer.js?v=20260917market"></script>
 <script type="module" src="./js/register-flow.js?v=20260920usd"></script>