[fix](trx-frontend-http): prevent browser hang on logout

Replace location.reload() with disconnect() + auth gate to prevent
browser hang when logging out. The full page reload was causing
issues with resource loading and event source reconnection timers.

Changes:
- Add disconnect() function to cleanly close EventSource connections
  and clear all timers (esHeartbeat, reconnectTimer)
- authLogout() now disconnects locally and shows auth gate instead
  of reloading the page
- Faster logout experience without full page reload

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>

src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js

@@ -48,9 +48,14 @@ async function authLogout() {
     const resp = await fetch("/auth/logout", { method: "POST" });
     if (!resp.ok) throw new Error("Logout failed");
     authRole = null;
-    location.reload();
+    // Disconnect and show auth gate without page reload
+    disconnect();
+    document.getElementById("content").style.display = "none";
+    updateAuthUI();
+    showAuthGate(false);
   } catch (e) {
     console.error("Logout failed:", e);
+    showAuthError("Logout failed");
   }
 }
 
@@ -909,6 +914,27 @@ function connect() {
   }, 5000);
 }
 
+function disconnect() {
+  // Close event sources
+  if (es) {
+    es.close();
+    es = null;
+  }
+  if (decodeSource) {
+    decodeSource.close();
+    decodeSource = null;
+  }
+  // Clear timers
+  if (esHeartbeat) {
+    clearInterval(esHeartbeat);
+    esHeartbeat = null;
+  }
+  if (reconnectTimer) {
+    clearTimeout(reconnectTimer);
+    reconnectTimer = null;
+  }
+}
+
 async function postPath(path) {
   const resp = await fetch(path, { method: "POST" });
   if (resp.status === 401 || resp.status === 403) {