Skip exchange PnL sync on hub iframe soft nav to fix slow records tab.

Remove hover prefetch and mark soft-nav fetches so Gate/OKX render pages from local DB without blocking on exchange history sync.

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

static/instance_theme.js

@@ -408,8 +408,6 @@
     if (!isHubLinked()) return;
 
     let navToken = 0;
-    const prefetch = new Map();
-    const PREFETCH_MAX = 8;
 
     function isSoftNavLink(a) {
       if (!a || !a.getAttribute) return false;
@@ -417,25 +415,11 @@
       return !!a.closest(".top-nav, .strategy-subnav");
     }
 
-    function rememberPrefetch(href, html) {
-      if (!href || !html) return;
-      if (prefetch.has(href)) prefetch.delete(href);
-      prefetch.set(href, html);
-      while (prefetch.size > PREFETCH_MAX) {
-        const first = prefetch.keys().next().value;
-        prefetch.delete(first);
-      }
-    }
-
-    function warmPrefetch(href) {
-      if (!href || prefetch.has(href)) return;
-      const token = navToken;
-      fetch(href, { credentials: "same-origin" })
-        .then((r) => (r.ok ? r.text() : null))
-        .then((html) => {
-          if (html && token === navToken) rememberPrefetch(href, html);
-        })
-        .catch(() => {});
+    function softNavFetch(href) {
+      return fetch(href, {
+        credentials: "same-origin",
+        headers: { "X-Instance-Soft-Nav": "1" },
+      });
     }
 
     async function navigateInFrame(href, opts) {
@@ -443,17 +427,13 @@
       notifyParentFrameNavStart();
       ensureNavOverlay();
       try {
-        let html = prefetch.get(href);
-        if (html) prefetch.delete(href);
-        if (!html) {
-          const r = await fetch(href, { credentials: "same-origin" });
-          if (token !== navToken) return;
-          if (!r.ok) {
-            location.assign(href);
-            return;
-          }
-          html = await r.text();
+        const r = await softNavFetch(href);
+        if (token !== navToken) return;
+        if (!r.ok) {
+          location.assign(href);
+          return;
         }
+        let html = await r.text();
         if (token !== navToken) return;
         html = injectNavOverlayIntoHtml(html, get());
         let path = href;
@@ -494,22 +474,6 @@
       true
     );
 
-    document.addEventListener(
-      "pointerenter",
-      (ev) => {
-        const a = ev.target.closest("a[href]");
-        if (!a || !isSoftNavLink(a)) return;
-        const rawHref = a.getAttribute("href");
-        if (!rawHref || rawHref.startsWith("#") || rawHref.startsWith("javascript:")) return;
-        try {
-          const target = new URL(rawHref, location.href);
-          if (target.origin !== location.origin) return;
-          warmPrefetch(target.pathname + target.search + target.hash);
-        } catch (_) {}
-      },
-      true
-    );
-
     window.addEventListener("popstate", () => {
       void navigateInFrame(location.pathname + location.search + location.hash, { replace: true });
     });