fix: build error in nextSong + apply romaji overrides to downloads

- Fix missing closing brace for `if (ni >= 0...)` in nextSong — the removed
  `else { _nsBridge('next') }` left the inner if-block unclosed, causing
  vite/rollup to reject player.js as invalid JS
- Apply romaji override map to iTunes (executeDownload) and Spotify
  (executeSpotifyDownload) download payloads — sends artistSort/albumArtistSort/
  titleSort/albumSort fields so the backend writes correct sort tags to the
  downloaded file and can organize into the right artist folder

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

src/player.js

@@ -716,6 +716,7 @@ export function nextSong() {
       // Explicit index prevents desync when JS and native queue pointers diverge.
       _nsBridge('seekToIndex', ni, 0);
       _nsBridge('play');
+    }
     // else: ni = -1 means end of queue with no repeat — let ExoPlayer stop naturally.
     if (S.radioMode && S.queue.length - S.qIdx < 5) fillRadioQueue();
     return;

src/ui.js

@@ -610,11 +610,15 @@ export async function executeDownload() {
   if(!S.downloadTarget || !S.cfg.backendUrl) return;
   closeDlModal();
   const jobId = 'job_' + Date.now();
+  const ov = getRomajiOverrides();
+  const _artist = S.downloadTarget.artistName || 'Unknown Artist';
+  const _title  = S.downloadTarget.trackName  || S.downloadTarget.collectionName || 'Unknown';
+  const _album  = S.downloadTarget.collectionName || '';
   const payload = {
     type:       S.dlType,
-    artist:     S.downloadTarget.artistName || 'Unknown Artist',
+    artist:     _artist,
-    title:      S.downloadTarget.trackName  || S.downloadTarget.collectionName || 'Unknown',
+    title:      _title,
-    album:      S.downloadTarget.collectionName || '',
+    album:      _album,
     artworkUrl:  S.downloadTarget.artworkUrl100 || S.downloadTarget.artworkUrl60 || '',
     itunesId:    S.downloadTarget.trackId || S.downloadTarget.collectionId || null,
     collectionId: S.downloadTarget.collectionId || null,
@@ -624,6 +628,9 @@ export async function executeDownload() {
     discNum:     S.downloadTarget.discNumber     || undefined,
     discTotal:   S.downloadTarget.discCount      || undefined,
     durationMs:  S.downloadTarget.trackTimeMillis || undefined,
+    ...(ov[_artist] && { artistSort: ov[_artist], albumArtistSort: ov[_artist] }),
+    ...(ov[_title]  && { titleSort:  ov[_title]  }),
+    ...(ov[_album]  && { albumSort:  ov[_album]  }),
   };
   addJob(jobId, payload.title, payload.artist, payload.type, payload.album);
   try {
@@ -644,11 +651,23 @@ export async function executeSpotifyDownload({ type, title, artist, artworkUrl,
   if (!S.cfg.backendUrl) { toast('⚠ Kein Backend konfiguriert'); return; }
   const jobId = 'job_' + Date.now();
   addJob(jobId, title, artist, type);
+  const ov = getRomajiOverrides();
+  const enrichedTracks = (tracks || []).map(t => {
+    const a = t.artistName || '';
+    const n = t.trackName  || '';
+    const al = t.collectionName || '';
+    return {
+      ...t,
+      ...(ov[a]  && { artistSort: ov[a], albumArtistSort: ov[a] }),
+      ...(ov[n]  && { titleSort:  ov[n] }),
+      ...(ov[al] && { albumSort:  ov[al] }),
+    };
+  });
   try {
     const res = await fetch(`${S.cfg.backendUrl}/api/download`, {
       method: 'POST',
       headers: { 'Content-Type': 'application/json' },
-      body: JSON.stringify({ jobId, type, title, artist, artworkUrl, tracks }),
+      body: JSON.stringify({ jobId, type, title, artist, artworkUrl, tracks: enrichedTracks }),
     });
     if (!res.ok) throw new Error(`HTTP ${res.status}`);
     pollJob(jobId);