fix: clamp ETA bounds, store stats interval, add activeDownloads finally-cleanup, prevent progress backward jump

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/main.ts

@@ -2204,17 +2204,19 @@ function downloadVODPart(
                     if (speed > 0 && downloadedBytes > 0) {
                         const itemStartTime = itemTracking.startTime;
                         const elapsedSec = (Date.now() - itemStartTime) / 1000;
-                        if (elapsedSec > 3) {
+                        if (elapsedSec > 5) { // Wait at least 5 seconds before showing ETA
                             const avgSpeed = downloadedBytes / elapsedSec;
                             if (expectedDurationSeconds && expectedDurationSeconds > 0) {
                                 const estimatedTotalBytes = avgSpeed * expectedDurationSeconds;
                                 if (estimatedTotalBytes > downloadedBytes) {
                                     const remainingSec = (estimatedTotalBytes - downloadedBytes) / avgSpeed;
+                                    if (remainingSec > 0 && remainingSec < 86400) { // Between 0 and 24 hours
                                         etaStr = formatETA(remainingSec);
                                     }
                                 }
                             }
                         }
+                    }
 
                     onProgress({
                         id: itemId,
@@ -2798,6 +2800,7 @@ async function processOneQueueItem(item: QueueItem): Promise<void> {
 
     item.last_error = '';
 
+    try {
         let finalResult: DownloadResult = { success: false, error: 'Unbekannter Fehler beim Download' };
         const maxAttempts = getRetryAttemptLimit();
 
@@ -2861,8 +2864,6 @@ async function processOneQueueItem(item: QueueItem): Promise<void> {
 
         if (!hasQueueItemId(item.id)) {
             appendDebugLog('queue-item-finished-removed', { itemId: item.id });
-        activeDownloads.delete(item.id);
-        cancelledItemIds.delete(item.id);
             return;
         }
 
@@ -2877,9 +2878,6 @@ async function processOneQueueItem(item: QueueItem): Promise<void> {
             runtimeMetrics.downloadsFailed += 1;
         }
 
-    activeDownloads.delete(item.id);
-    cancelledItemIds.delete(item.id);
-
         appendDebugLog('queue-item-finished', {
             itemId: item.id,
             status: item.status,
@@ -2888,6 +2886,10 @@ async function processOneQueueItem(item: QueueItem): Promise<void> {
 
         saveQueue(downloadQueue);
         emitQueueUpdated();
+    } finally {
+        activeDownloads.delete(item.id);
+        cancelledItemIds.delete(item.id);
+    }
 }
 
 async function processQueue(): Promise<void> {

src/renderer.ts

@@ -99,7 +99,7 @@ async function init(): Promise<void> {
 
     // Update stats bar
     updateStatsBar();
-    setInterval(updateStatsBar, 5000);
+    const _statsInterval = setInterval(updateStatsBar, 5000);
 
     if (config.client_id && config.client_secret) {
         await connect();
@@ -275,9 +275,14 @@ function mergeQueueState(nextQueue: QueueItem[]): QueueItem[] {
             return item;
         }
 
+        // Keep the higher progress value to prevent backward jumps from stale data
+        const bestProgress = (prev.status === 'downloading' && prev.progress > item.progress)
+            ? prev.progress
+            : (item.progress > 0 ? item.progress : prev.progress);
+
         return {
             ...item,
-            progress: item.progress > 0 ? item.progress : prev.progress,
+            progress: bestProgress,
             speed: item.speed || prev.speed,
             eta: item.eta || prev.eta,
             currentPart: item.currentPart || prev.currentPart,