Add quality indicator and re-download at quality to Watch page

- Quality selector now always visible when idle (not just pre-download)
- Saved chip shows actual downloaded resolution (e.g. "Saved · 1080p")
- Re-download chip deletes existing file and starts new download at selected quality

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/pages/Watch.jsx

@@ -562,6 +562,7 @@ export default function Watch() {
   const [queued, setQueued] = useState(null);
   const [liked, setLiked] = useState(null);
   const [disliked, setDisliked] = useState(null);
+  const [isRedownloading, setIsRedownloading] = useState(false);
   const [selectedQuality, setSelectedQuality] = useState(null);
   const [speed, setSpeed] = useState(1);
   const [autoplay, setAutoplay] = useState(false);
@@ -721,6 +722,22 @@ export default function Watch() {
     setPlayRequested(true);
     downloadMut.mutate();
   }, [downloadMut]);
+  const handleRedownload = useCallback(async () => {
+    const dlId = downloadId ?? allDownloads.find(
+      d => d.youtube_video_id === youtubeVideoId && d.status === "complete"
+    )?.id;
+    if (!dlId) return;
+    setIsRedownloading(true);
+    try { await deleteDownload(dlId); } catch (_) {}
+    setFileReady(false);
+    setConfirmedFileUrl(null);
+    setDownloadId(null);
+    setPlayRequested(false);
+    setIsRedownloading(false);
+    qc.invalidateQueries({ queryKey: ["downloads"] });
+    refetchVideo();
+    downloadMut.mutate();
+  }, [downloadId, allDownloads, youtubeVideoId, downloadMut, refetchVideo, qc]);
 
   const saveProgress = useCallback((secs) => {
     if (!video?.id) return;
@@ -792,6 +809,7 @@ export default function Watch() {
   const isLiked = liked ?? video?.liked ?? false;
   const isDisliked = disliked ?? (video?.rating === -1) ?? false;
   const dlComplete = dlStatus?.status === "complete" || video?.is_downloaded;
+  const downloadedResolution = dlStatus?.resolution ?? video?.download_resolution;
   const isFollowed = followMut.isSuccess || video?.channel_followed;
   const subs = formatSubs(channel?.subscriber_count);
 
@@ -912,7 +930,7 @@ export default function Watch() {
 
             {/* Actions */}
             <div className="flex items-center gap-1.5 flex-wrap">
-              {!dlComplete && !isDownloading && !downloadMut.isPending && (
+              {!isDownloading && !downloadMut.isPending && !isRedownloading && (
                 <select
                   value={selectedQuality ?? "best"}
                   onChange={(e) => setSelectedQuality(e.target.value)}
@@ -952,7 +970,7 @@ export default function Watch() {
                 onClick={() => !dlComplete && !isDownloading && downloadMut.mutate()}
               >
                 {dlComplete ? (
-                  <><svg className="w-4 h-4" fill="currentColor" viewBox="0 0 24 24"><path d="M9 16.2l-3.5-3.5-1.4 1.4L9 19 21 7l-1.4-1.4L9 16.2z"/></svg>Saved</>
+                  <><svg className="w-4 h-4" fill="currentColor" viewBox="0 0 24 24"><path d="M9 16.2l-3.5-3.5-1.4 1.4L9 19 21 7l-1.4-1.4L9 16.2z"/></svg>Saved{downloadedResolution ? ` · ${downloadedResolution}` : ""}</>
                 ) : isDownloading || downloadMut.isPending ? (
                   <><svg className="w-3.5 h-3.5 animate-spin" fill="none" viewBox="0 0 24 24"><circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4"/><path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8v4a4 4 0 00-4 4H4z"/></svg>Downloading</>
                 ) : (
@@ -969,6 +987,16 @@ export default function Watch() {
                 </Chip>
               )}
 
+              {dlComplete && (
+                <Chip onClick={handleRedownload} disabled={isRedownloading || downloadMut.isPending}>
+                  <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2}
+                      d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15"/>
+                  </svg>
+                  Re-download
+                </Chip>
+              )}
+
               {video?.id && (
                 <>
                   <Chip active={isLiked} onClick={() => likeMut.mutate()} disabled={likeMut.isPending}>