币本位隐藏 USDT↔USDC 兑换，持仓区与设置仅保留划转。

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/common/static/options_settings.js

@@ -42,9 +42,13 @@
     return window.confirm(message);
   }
 
-  function roundAvail(v) {
+  function roundAvail(v, ccy) {
     const n = Number(v);
     if (!Number.isFinite(n) || n <= 0) return null;
+    const u = String(ccy || "").toUpperCase();
+    if (u === "ETH" || u === "BTC") {
+      return Math.round(n * 1e8) / 1e8;
+    }
     return Math.round(n * 100) / 100;
   }
 
@@ -63,7 +67,7 @@
     const c = String(ccy || "").toLowerCase();
     const availKey = acct + "_" + c + "_avail";
     const totalKey = acct + "_" + c;
-    return roundAvail(bal[availKey] != null ? bal[availKey] : bal[totalKey]);
+    return roundAvail(bal[availKey] != null ? bal[availKey] : bal[totalKey], ccy);
   }
 
   async function resolveSwapMaxAmount(dir) {
@@ -130,10 +134,11 @@
 
   function bindFundsUi(ids) {
     const swapBtn = document.getElementById(ids.swapBtn);
-    if (!swapBtn) return;
+    const intBtn = document.getElementById(ids.intBtn);
+    if (!swapBtn && !intBtn) return;
 
-    const swapBtns = [ids.swapBtn, ids.swapAllBtn];
-    const intBtns = [ids.intBtn, ids.intAllBtn];
+    const swapBtns = [ids.swapBtn, ids.swapAllBtn].filter(Boolean);
+    const intBtns = [ids.intBtn, ids.intAllBtn].filter(Boolean);
 
     async function submitSwap(amount) {
       setButtonsBusy(swapBtns, ids.swapAmount, true, "兑换中…");
@@ -191,14 +196,16 @@
       }
     }
 
-    swapBtn.addEventListener("click", async function () {
-      const amount = parseFloat(document.getElementById(ids.swapAmount).value);
-      if (!amount || amount <= 0) {
-        setMsg(ids.swapMsg, "请输入有效数量", true);
-        return;
-      }
-      await submitSwap(amount);
-    });
+    if (swapBtn) {
+      swapBtn.addEventListener("click", async function () {
+        const amount = parseFloat(document.getElementById(ids.swapAmount).value);
+        if (!amount || amount <= 0) {
+          setMsg(ids.swapMsg, "请输入有效数量", true);
+          return;
+        }
+        await submitSwap(amount);
+      });
+    }
 
     const swapAllBtn = document.getElementById(ids.swapAllBtn);
     if (swapAllBtn) {
@@ -247,7 +254,6 @@
       });
     }
 
-    const intBtn = document.getElementById(ids.intBtn);
     if (intBtn) {
       intBtn.addEventListener("click", async function () {
         const amount = parseFloat(document.getElementById(ids.intAmount).value);