Add index-over-ask leverage column to options chain list.

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

lib/common/static/instance_theme.css

@@ -3138,6 +3138,15 @@ html[data-theme="light"] .settings-side-export-label {
   font-variant-numeric: tabular-nums;
   white-space: nowrap;
 }
+.opt-chain-lev {
+  font-variant-numeric: tabular-nums;
+  white-space: nowrap;
+  font-weight: 600;
+  color: #b8c8ff;
+}
+html[data-theme="light"] .opt-chain-lev {
+  color: #1a4a8a;
+}
 .opt-be-dist-up {
   color: #5ee89a;
 }

lib/common/static/options_panel.js

@@ -341,7 +341,7 @@
   }
 
   function strikeTableColspan() {
-    return state.chainView === "t" ? 9 : 8;
+    return 9;
   }
 
   function syncChainViewUI() {
@@ -817,6 +817,20 @@
     return "约 " + Number(v).toFixed(1) + "×";
   }
 
+  /** 链上展示:指数 ÷ 卖一(每1币). */
+  function calcAskLeverage(indexPx, askPx) {
+    if (indexPx == null || askPx == null) return null;
+    const idx = Number(indexPx);
+    const ask = Number(askPx);
+    if (!Number.isFinite(idx) || !Number.isFinite(ask) || ask <= 0) return null;
+    return Math.round((idx / ask) * 10) / 10;
+  }
+
+  function fmtChainLeverage(v) {
+    if (v === null || v === undefined || Number.isNaN(Number(v))) return "—";
+    return Number(v).toFixed(1) + "×";
+  }
+
   function fmtUsdcSigned(v) {
     if (v === null || v === undefined || Number.isNaN(Number(v))) return "—";
     const n = Number(v);
@@ -946,16 +960,19 @@
       return;
     }
     let matchedSelected = false;
+    const indexPx = state.chain && state.chain.index_px;
     list.forEach(function (c) {
       const tr = document.createElement("tr");
       tr.className = "opt-strike-row";
       tr.setAttribute("data-inst", c.inst_id);
       if (c.moneyness) tr.classList.add("opt-row-" + c.moneyness);
+      const chainLev = calcAskLeverage(indexPx, c.ask);
       tr.innerHTML =
         "<td>" + c.strike + "</td>" +
         "<td>" + moneynessBadge(c) + "</td>" +
         "<td><code>" + c.inst_id + "</code></td>" +
         "<td class=\"opt-px-sz\">" + fmtPxSz(c.ask, c.ask_sz, c.ask_estimated) + "</td>" +
+        '<td class="opt-chain-lev">' + fmtChainLeverage(chainLev) + "</td>" +
         "<td class=\"opt-px-sz\">" + fmtPxSz(c.bid, c.bid_sz) + "</td>" +
         "<td>" + (c.expiry_be_px != null ? fmt(c.expiry_be_px, 0) : "—") + "</td>" +
         '<td class="' + distBeClass(c.dist_expiry_be) + '">' + fmtDist(c.dist_expiry_be) + "</td>" +