fix: serverInfo page shows data immediately on load

Eliminated redundant serverinfo RCON polling from the serverInfo page.
It now subscribes to the header's serverinfo-update CustomEvent instead.

Key changes:
- app.js: cache last serverinfo in window._lastServerInfo and dispatch
  serverinfo-update event so pages can pick up data immediately
- serverInfo.js: replaced setInterval-based polling with event listener
  plus immediate _lastServerInfo cache check, eliminating the initial
  blank page state and duplicate RCON requests

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

js/pages/serverInfo.js

@@ -45,13 +45,6 @@ function ServerInfoPage(params, container) {
     '</div>';
   container.innerHTML = html;
 
-  // Start data polling immediately — charts will render when ready
-  if (Rcon.isConnected()) startPolling();
-  else {
-    var _c = function () { startPolling(); Rcon.off('connected', _c); };
-    Rcon.on('connected', _c);
-  }
-
   // ---- NVD3 Charts ----
   nv.addGraph(function () {
     var perfChart = nv.models.multiChart()
@@ -109,13 +102,12 @@ function ServerInfoPage(params, container) {
   });
 
   // ---- Data polling ----
-  var pollTimer = null;
+  // Subscribe to header's serverinfo updates (no redundant RCON request)
+  function onServerInfo(e) { updateData(e.detail); }
+  document.addEventListener('serverinfo-update', onServerInfo);
 
-  function refresh() {
-    Rcon.request('serverinfo', function (msg) {
-      updateData(JSON.parse(msg.Message));
-    });
-  }
+  // If header already has cached data, use it immediately
+  if (window._lastServerInfo) updateData(window._lastServerInfo);
 
   function updateData(data) {
     // Guard: element may be gone if navigated away
@@ -185,13 +177,8 @@ function ServerInfoPage(params, container) {
     }
   }
 
-  function startPolling() {
-    refresh();
-    pollTimer = setInterval(refresh, 1000);
-  }
-
   return function cleanup() {
-    if (pollTimer) clearInterval(pollTimer);
+    document.removeEventListener('serverinfo-update', onServerInfo);
     window._perfChart = null;
     window._netChart = null;
     window._playersChart = null;