Server: If-Modified-Since, block bis Änderung; Client: sofortiger Re-Poll

app.js

@@ -440,13 +440,12 @@ function startAutoRefresh() {
     document.getElementById('refresh-timer').textContent = '● Live';
     document.getElementById('refresh-timer').style.color = '#4ade80';
     
-    async function poll() {
-        while (true) {
+    const myId = ++pollId;
+    (async function poll() {
+        while (pollId === myId) {
             await loadPGN(false);
-            await new Promise(r => setTimeout(r, 30000));
         }
-    }
-    poll();
+    })();
 }
 
 /**
@@ -470,7 +469,7 @@ function hideError() {
  */
 document.getElementById('refresh-btn').addEventListener('click', () => {
     pollId++;
-    loadPGN(true);
+    loadPGN(true).then(() => startAutoRefresh());
 });
 
 /**