fix: skip iTunes album/duration enrichment for Japanese Spotify tracks to prevent wrong-song downloads

src/spotify.js

@@ -287,17 +287,26 @@ async function _loadSpotifyTrackArtwork(tracks, listEl) {
         const results = await itunesSearch(`${t.trackName} ${firstArtist}`, 'musicTrack', 1);
         const match = results[0];
         if (!match) return;
-        // Enrich track object so downloads get correct metadata
+        // Always safe to enrich: artwork, preview, explicit, iTunes artist name
         if (match.artworkUrl100)      t.artworkUrl100      = match.artworkUrl100;
-        if (match.collectionName)     t.collectionName     = match.collectionName;
-        if (match.releaseDate)        t.releaseDate        = match.releaseDate;
-        if (match.trackNumber)        t.trackNumber        = match.trackNumber;
         if (match.trackExplicitness)  t.trackExplicitness  = match.trackExplicitness;
         if (match.previewUrl)         t.previewUrl         = match.previewUrl;
-        if (match.trackTimeMillis)    t.durationMs         = match.trackTimeMillis;
         // Store iTunes canonical name separately — keeps original Spotify/Japanese in artistName
         // so the UI shows the original and YTM search uses the original channel name.
         if (match.artistName) t.itunesArtistName = match.artistName;
+        // Only enrich album/duration if we're confident the iTunes match is the correct song.
+        // For Japanese titles we can't word-match, so we skip — the backend's lookupItunesTrackMeta
+        // handles it with better matching. For ASCII titles, require at least one shared word.
+        const JP_RE = /[ぁ-んァ-ン一-龯]/;
+        const isJapanese = JP_RE.test(t.trackName);
+        const _norm = s => new Set((s||'').toLowerCase().replace(/[^a-z0-9]/g,' ').split(/\s+/).filter(Boolean));
+        const titleMatch = !isJapanese && [..._norm(t.trackName)].some(w => _norm(match.trackName).has(w));
+        if (titleMatch) {
+          if (match.collectionName)   t.collectionName     = match.collectionName;
+          if (match.releaseDate)      t.releaseDate        = match.releaseDate;
+          if (match.trackNumber)      t.trackNumber        = match.trackNumber;
+          if (match.trackTimeMillis)  t.durationMs         = match.trackTimeMillis;
+        }
         if (window._spotifyResolved?.tracks?.[idx]) Object.assign(window._spotifyResolved.tracks[idx], t);
         const url = match.artworkUrl100 || match.artworkUrl60 || '';
         if (url) _setArt(artEls[idx], url);