fix: SC metadata fields, albumartist & separator, importer clear, folder rename on album edit

- SC tracks: use artworkUrl/album/genre fields (not iTunes artworkUrl100/collectionName/primaryGenreName)
- Playlist handler: same SC field fallbacks for artwork, album, genre, year
- ytdlp.js: convert & to , in album_artist tag so Navidrome albumartist.Split works
- Importer: clear both previews on any URL input change, not just on clear
- edit-metadata: rename album folder on disk when album name changes

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

backend/lib/ytdlp.js

@@ -312,7 +312,7 @@ async function embedMetadata({ jobId, audioFile, dir, trackPrefix, safeTitle, ar
       '-id3v2_version', '3',
       '-metadata', `title=${title}`,
       '-metadata', `artist=${navidromeArtist(artist)}`,
-      '-metadata', `album_artist=${mainArtist}`,
+      '-metadata', `album_artist=${mainArtist.replace(/\s+&\s+/g, ', ')}`,
     );
     if (album)       ffArgs.push('-metadata', `album=${album}`);
     if (year)        ffArgs.push('-metadata', `date=${String(year)}`);

backend/novasonic-server.js

@@ -17,7 +17,7 @@ const crypto         = require('crypto');
 
 const CONFIG    = require('./lib/config');
 const { jobs, updateJob, log } = require('./lib/jobs');
-const { lookupItunesTrackMeta, fetchItunesTracks, searchItunesAlbumTracks } = require('./lib/metadata');
+const { sanitize, lookupItunesTrackMeta, fetchItunesTracks, searchItunesAlbumTracks } = require('./lib/metadata');
 const { downloadTrack, downloadAlbumTracks } = require('./lib/downloader');
 const { buildRomajiIndex, clearRomajiCache, isTokenizerReady, fetchNdSongs } = require('./lib/romaji');
 
@@ -243,15 +243,16 @@ app.post('/api/download', async (req, res) => {
     try {
       if (type === 'track') {
         const sp     = req.body.tracks?.[0] || {};
-        const spAlbum = sp.collectionName || album || '';
+        const spAlbum = sp.collectionName || sp.album || album || '';
-        const spArt   = sp.artworkUrl100  || artworkUrl || '';
+        const spArt   = sp.artworkUrl100  || sp.artworkUrl  || artworkUrl || '';
-        const spYear  = sp.releaseDate ? new Date(sp.releaseDate).getFullYear() : undefined;
+        const spYear  = sp.releaseDate ? new Date(sp.releaseDate).getFullYear() : (sp.year || undefined);
         let meta = {
           album: spAlbum, year: spYear,
           trackNum:    sp.trackNumber  || bodyTrackNum    || undefined,
           totalTracks: sp.trackCount   || bodyTotalTracks || undefined,
           discNum:     sp.discNumber   || bodyDiscNum     || undefined,
           discTotal:   sp.discCount    || bodyDiscTotal   || undefined,
+          genre:       sp.primaryGenreName || sp.genre    || undefined,
           artworkUrl: spArt, explicit: sp.trackExplicitness === 'explicit' || !!explicit,
           durationMs: sp.durationMs || undefined,
         };
@@ -260,7 +261,7 @@ app.post('/api/download', async (req, res) => {
           log(jobId, '📋 Suche Album-Metadaten von iTunes…');
           const extra = await lookupItunesTrackMeta(searchArtist, title);
           if (extra.album) log(jobId, `📋 Album: "${extra.album}" (${extra.year || '?'})`);
-          meta = { ...meta, ...extra, artworkUrl: spArt || extra.artworkUrl || '' };
+          meta = { ...meta, ...extra, artworkUrl: spArt || extra.artworkUrl || '', genre: meta.genre || extra.genre || undefined };
         } else {
           log(jobId, `📋 Album aus Spotify: "${meta.album}"`);
         }
@@ -343,12 +344,12 @@ app.post('/api/download', async (req, res) => {
               artist:      trackArtist,
               albumArtist: trackArtist,
               title:       trackTitle,
-              album:       itunes.album       || track.collectionName || '',
+              album:       itunes.album       || track.collectionName || track.album || '',
-              year:        itunes.year        || (track.releaseDate ? new Date(track.releaseDate).getFullYear() : undefined),
+              year:        itunes.year        || (track.releaseDate ? new Date(track.releaseDate).getFullYear() : undefined) || track.year,
               trackNum:    itunes.trackNum    || track.trackNumber    || undefined,
               totalTracks: itunes.totalTracks || undefined,
-              genre:       itunes.genre       || track.primaryGenreName || undefined,
+              genre:       itunes.genre       || track.primaryGenreName || track.genre || undefined,
-              artworkUrl:  itunes.artworkUrl  || track.artworkUrl100  || artworkUrl || '',
+              artworkUrl:  itunes.artworkUrl  || track.artworkUrl100  || track.artworkUrl || artworkUrl || '',
               explicit:    track.trackExplicitness === 'explicit',
               durationMs:  itunes.durationMs  || track.durationMs    || undefined,
               sourceUrl:   track.sourceUrl    || undefined,
@@ -578,6 +579,18 @@ app.post('/api/edit-metadata', async (req, res) => {
     fs.renameSync(tmpFile, filePath);
     if (artFile) try { fs.unlinkSync(artFile); } catch {}
 
+    // Rename album folder if album changed and folder name matches old album dir
+    if (album) {
+      const dir        = path.dirname(filePath);
+      const newDirName = sanitize(album);
+      if (path.basename(dir) !== newDirName) {
+        const newDir = path.join(path.dirname(dir), newDirName);
+        if (!fs.existsSync(newDir)) {
+          try { fs.renameSync(dir, newDir); } catch (e) { console.error('[edit-metadata] folder rename:', e.message); }
+        }
+      }
+    }
+
     // Trigger Navidrome rescan
     try {
       const salt2 = Math.random().toString(36).slice(2, 10);

src/spotify.js

@@ -7,6 +7,11 @@ import { openDlModal } from './ui.js';
 
 // ─── UNIFIED IMPORTER INPUT ───
 export function onImporterInput(val) {
+  // Always clear results when URL changes
+  document.getElementById('spotify-preview').style.display = 'none';
+  document.getElementById('sc-preview').style.display = 'none';
+  document.getElementById('importer-hint').style.display = val ? 'none' : '';
+
   const badge = document.getElementById('importer-badge');
   const btn   = document.getElementById('importer-btn');
   if (!badge || !btn) return;
@@ -32,12 +37,6 @@ export function onImporterInput(val) {
     btn.style.color = '';
     btn.style.borderColor = '';
   }
-  // Hide results when input is cleared
-  if (!val) {
-    document.getElementById('spotify-preview').style.display = 'none';
-    document.getElementById('sc-preview').style.display = 'none';
-    document.getElementById('importer-hint').style.display = '';
-  }
 }
 
 export async function resolveImporterLink() {