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12be560cb8
Add FFmpegService.embedMetadataToM4a() for writing tags and cover art into M4A files via FFmpeg. Fix two bugs in the same function: - Remove '-disposition:v:0 attached_pic' which is only valid for Matroska/WebM containers and causes FFmpeg to error on MP4/M4A - Apply same fix to _convertToAlac which had the identical issue Add M4A handling (isM4A branch) to all four embed call-sites: track_metadata_screen (lyrics embed, re-enrich, edit metadata sheet, format conversion), queue_tab, local_album_screen, and downloaded_album_screen. Add 'LYRICS'/'UNSYNCEDLYRICS' to _mapMetadataForTagEmbed so existing lyrics survive a re-enrich cycle on M4A/MP3/Opus files. Preserve existing lyrics before overwriting tags in the edit metadata sheet (best-effort readFileMetadata before FFmpeg pass). Extract mergePlatformMetadataForTagEmbed() into lyrics_metadata_helper to deduplicate the identical metadata-mapping loops that existed in queue_tab, local_album_screen, downloaded_album_screen, and track_metadata_screen. Wire ensureLyricsMetadataForConversion into the format conversion path in track_metadata_screen so lyrics are carried through conversions. Add ISRC and LABEL/ORGANIZATION mappings to _convertToM4aTags.