Hub market: add option expiry Friday yellow dashed splits.

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

manual_trading_hub/static/chart.js

@@ -197,9 +197,11 @@
   const elPrevCloseLine = document.getElementById("market-prev-close-line");
   const elPrevHlLines = document.getElementById("market-prev-hl-lines");
   const elDaySplit = document.getElementById("market-day-split");
+  const elOptionExpirySplit = document.getElementById("market-option-expiry-split");
   const PREV_CLOSE_LINE_STORAGE_KEY = "hub-market-prev-close-line";
   const PREV_HL_LINES_STORAGE_KEY = "hub-market-prev-hl-lines";
   const DAY_SPLIT_STORAGE_KEY = "hub-market-day-split";
+  const OPTION_EXPIRY_SPLIT_STORAGE_KEY = "hub-market-option-expiry-split";
   const BJ_OFFSET_SEC = 8 * 60 * 60;
   const elFsToolbar = document.getElementById("market-fs-toolbar");
   const elFsExchange = document.getElementById("market-fs-exchange");
@@ -342,6 +344,14 @@
     saveBoolPref(DAY_SPLIT_STORAGE_KEY, on);
   }
 
+  function loadOptionExpirySplitPref() {
+    return loadBoolPref(OPTION_EXPIRY_SPLIT_STORAGE_KEY, false);
+  }
+
+  function saveOptionExpirySplitPref(on) {
+    saveBoolPref(OPTION_EXPIRY_SPLIT_STORAGE_KEY, on);
+  }
+
   function loadPrevCloseLinePref() {
     return loadBoolPref(PREV_CLOSE_LINE_STORAGE_KEY, false);
   }
@@ -456,6 +466,18 @@
     applyTradingDaySplit(on);
   }
 
+  function applyOptionExpirySplit(enabled) {
+    if (window.HubChartDraw && typeof window.HubChartDraw.setOptionExpirySplit === "function") {
+      window.HubChartDraw.setOptionExpirySplit(enabled);
+    }
+  }
+
+  function syncOptionExpirySplitUi() {
+    const on = !!(elOptionExpirySplit && elOptionExpirySplit.checked);
+    saveOptionExpirySplitPref(on);
+    applyOptionExpirySplit(on);
+  }
+
   function ensureDrawLayer() {
     if (drawAttached || !window.HubChartDraw || !chart || !candleSeries) return;
     window.HubChartDraw.attach({
@@ -471,6 +493,9 @@
     });
     window.HubChartDraw.setViewKey(currentChartViewKey());
     applyTradingDaySplit(elDaySplit ? elDaySplit.checked : loadDaySplitPref());
+    applyOptionExpirySplit(
+      elOptionExpirySplit ? elOptionExpirySplit.checked : loadOptionExpirySplitPref()
+    );
     drawAttached = true;
   }
 
@@ -3481,6 +3506,11 @@
       elDaySplit.addEventListener("change", syncTradingDaySplitUi);
       applyTradingDaySplit(elDaySplit.checked);
     }
+    if (elOptionExpirySplit) {
+      elOptionExpirySplit.checked = loadOptionExpirySplitPref();
+      elOptionExpirySplit.addEventListener("change", syncOptionExpirySplitUi);
+      applyOptionExpirySplit(elOptionExpirySplit.checked);
+    }
     const pageMarket = document.getElementById("page-market");
     const fsKeyTargets = [window, pageMarket, elChartWrap, chartHost].filter(Boolean);
     fsKeyTargets.forEach(function (el) {