Update app.py

app.py

@@ -651,8 +651,8 @@ HTML_TEMPLATE = """
                     }
                     
                     const centerIdx = kList.indexOf(closestK);
-                    const start = Math.max(0, centerIdx - 12);
-                    const end = Math.min(kList.length, centerIdx + 12);
+                    const start = Math.max(0, centerIdx - 18);
+                    const end = Math.min(kList.length, centerIdx + 18);
                     const viewKs = kList.slice(start, end);
                     
                     OPT_SYMS.forEach(o => {
@@ -663,7 +663,7 @@ HTML_TEMPLATE = """
                  // Fallback if no spot price yet (initial load)
                  const kList = Array.from(document.querySelectorAll('.row')).map(r => parseFloat(r.dataset.k));
                  const mid = Math.floor(kList.length/2);
-                 const viewKs = kList.slice(Math.max(0, mid-10), mid+10);
+                 const viewKs = kList.slice(Math.max(0, mid-18), mid+18);
                  OPT_SYMS.forEach(o => { if(viewKs.includes(o.k)) symbolsToFetch.push(o.s); });
             }