refactor: migrate audio metadata tagging from ts to rust

- Add id3 and metaflac crates for native audio tagging
- Create tagger.rs with separate tag_mp3() and tag_flac() functions
- Implement tag_audio_file Tauri command for unified tagging interface
- Support full metadata: title, artist, album, track#, ISRC, BPM, lyrics, cover art
- Create TypeScript wrapper (tagger.ts) for calling Rust backend
- Update downloader.ts to use Rust tagging for both MP3 and FLAC
- Remove browser-id3-writer dependency (no browser FLAC support)
- Inline lyrics parsing in addToQueue.ts (no longer needed in tagger)

src/lib/services/deezer/addToQueue.ts

@@ -5,7 +5,6 @@
 
 import { deezerAPI } from '$lib/services/deezer';
 import { addToQueue } from '$lib/stores/downloadQueue';
-import { parseLyricsToLRC, parseLyricsToSYLT, parseLyricsText } from './tagger';
 
 /**
  * Fetch track metadata and add to download queue
@@ -39,10 +38,20 @@ export async function addDeezerTrackToQueue(trackId: string): Promise<void> {
   // Parse lyrics if available
   let lyrics = undefined;
   if (lyricsData) {
+    // Parse LRC format (synced lyrics)
+    let syncLrc = '';
+    if (lyricsData.LYRICS_SYNC_JSON) {
+      for (const line of lyricsData.LYRICS_SYNC_JSON) {
+        const text = line.line || '';
+        const timestamp = line.lrc_timestamp || '[00:00.00]';
+        syncLrc += `${timestamp}${text}\n`;
+      }
+    }
+
     lyrics = {
-      sync: parseLyricsToLRC(lyricsData),
-      unsync: parseLyricsText(lyricsData),
-      syncID3: parseLyricsToSYLT(lyricsData)
+      sync: syncLrc || undefined,
+      unsync: lyricsData.LYRICS_TEXT || undefined,
+      syncID3: undefined // No longer needed, handled by Rust tagger
     };
   }