Add countdown function to renderer.js

renderer.js

@@ -307,7 +307,14 @@ folders.forEach(folderObj => {
 
 
 
-
+  // Countdown in MM:SS-Format
+  function formatCountdown(ms) {
+    if (!ms || ms <= 0) return '00:00';
+    const s = Math.floor(ms / 1000);
+    const m = Math.floor(s / 60).toString().padStart(2, '0');
+    const sec = (s % 60).toString().padStart(2, '0');
+    return `${m}:${sec}`;
+  }