修复问题6

public/js/main.js

@@ -94,6 +94,7 @@ document.addEventListener('DOMContentLoaded', () => {
     let managedSubtitleTracks = [];
     let selectedSubtitleTrackId = 'off';
     let pendingAutoPlayAfterDownload = false;
+    let lastPolledProgressSignature = '';
 
     if (videoPlayer) {
         videoPlayer.controls = false;
@@ -1377,10 +1378,22 @@ document.addEventListener('DOMContentLoaded', () => {
     const pollProgress = async () => {
         if (!currentVideoKey) return;
         try {
-            const res = await fetch(`/api/progress?key=${encodeURIComponent(currentVideoKey)}`);
+            const res = await fetch(`/api/progress?key=${encodeURIComponent(currentVideoKey)}&_=${Date.now()}`, {
+                cache: 'no-store'
+            });
             if (!res.ok) return;
             const data = await res.json();
             if (data?.progress) {
+                const nextSignature = `${data.progress.status}:${typeof data.progress.percent === 'number' ? data.progress.percent : 'na'}`;
+                if (lastPolledProgressSignature !== nextSignature) {
+                    lastPolledProgressSignature = nextSignature;
+                    console.log('[progress-poll]', {
+                        status: data.progress.status,
+                        percent: data.progress.percent,
+                        downloadedBytes: data.progress.downloadedBytes,
+                        totalBytes: data.progress.totalBytes
+                    });
+                }
                 handleProgress(data.progress);
                 if (typeof data.progress.duration === 'number' && data.progress.duration > 0) {
                     videoDuration = data.progress.duration;