fix(wiki): harden alpha library hydration

wiki/alpha-library/index.html

@@ -30,6 +30,7 @@
   <link rel="icon" type="image/png" href="/assets/icon.png">
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+  <link rel="dns-prefetch" href="https://api.github.com">
   <link href="https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,600;9..144,750&family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Sans:wght@400;500;600;700&display=swap" rel="stylesheet">
   <link rel="stylesheet" href="/styles.css">
   <script type="module" src="/main.js"></script>
@@ -56,6 +57,10 @@
   </style>
 </head>
 <body>
+  <noscript>
+    <style>.alpha-stats, .alpha-zoos { display: none; }</style>
+    <p style="padding:24px;color:var(--muted);">Enable JavaScript to load alpha stats.</p>
+  </noscript>
   <header class="site-header" id="site-header">
     <div class="site-header__inner">
       <a class="brand" href="/home/" aria-label="Vibe-Trading home">
@@ -163,7 +168,7 @@ vibe-trading alpha bench --zoo gtja191 --universe csi300 --period 2020-2025</cod
   <script>
     // Runtime hydration of stats + per-zoo counts from the generated index.json.
     (function () {
-      fetch("content/index.json", { cache: "no-store" })
+      fetch("content/index.json", { cache: "default" })
         .then(function (r) { if (!r.ok) throw new Error("index.json " + r.status); return r.json(); })
         .then(function (data) {
           var total = document.getElementById("stat-total");
@@ -175,10 +180,14 @@ vibe-trading alpha bench --zoo gtja191 --universe csi300 --period 2020-2025</cod
           if (zoos) zoos.textContent = String(data.zoo_count || 0);
           if (gen && data.generated_at) {
             try { gen.textContent = new Date(data.generated_at).toISOString().slice(0, 10); }
-            catch (e) { gen.textContent = String(data.generated_at).slice(0, 10); }
+            catch (e) { gen.textContent = "unknown"; }
           }
+          var countEls = Array.prototype.slice.call(document.querySelectorAll(".count[data-zoo]"));
           (data.zoos || []).forEach(function (z) {
-            var el = document.querySelector('.count[data-zoo="' + z.zoo_id + '"]');
+            var zooId = String(z.zoo_id || "");
+            var el = countEls.find(function (candidate) {
+              return candidate.dataset.zoo === zooId;
+            });
             if (el) el.textContent = z.count + " alphas";
           });
         })