Show ~5 option rows by default; hide available USDT in perp quote.

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

lib/common/static/hedge_plan.js

@@ -202,7 +202,8 @@
     return m === "itm" || m === "atm";
   }
 
-  const PO_ATM_SIDE = 3;
+  // 默认共约 5 档:平值 + 实值2 + 虚值2
+  const PO_ATM_SIDE = 2;
 
   function slicePoListByMoneyness(list) {
     if (state.poStrikeExpandAll || !list.length) return list;
@@ -1245,10 +1246,9 @@
         ooIdx.textContent = "指数 " + fmt(mIdx, 2);
       }
     }
+    // OKX 交易账户 USDT 共用,永续行情不单独显示「可用 USDT」
     const quoteHtml =
-      "可用 <strong>" +
-      fmt(d.available_usdt, 2) +
-      "</strong> USDT · 卖一 " +
+      "卖一 " +
       fmt(d.ask, 2) +
       " · 买一 " +
       fmt(d.bid, 2) +
@@ -1562,7 +1562,7 @@
       hintTr.innerHTML =
         '<td colspan="' +
         cols +
-        '" class="muted opt-strike-hint">默认显示平值 + 实值3档 + 虚值3档 · 勾选「展开全部」查看该到期更多行权价</td>';
+        '" class="muted opt-strike-hint">默认显示约 5 档(平值 + 实值2 + 虚值2) · 勾选「展开全部」查看该到期更多行权价</td>';
       tbody.appendChild(hintTr);
     }
     tbody.querySelectorAll(".hp-pick").forEach(function (btn) {