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9dcec35056
Add a full TTML (Timed Text Markup Language) sidecar lyrics parser that extracts word/syllable-level timing from <span> elements, plus translation and pronunciation (transliteration) tracks from Apple Music TTML metadata sections. Backend changes: - TTML parser (core/lyrics/ttml.go) with support for all TTML time formats, nested timing contexts, and bare decimal second offsets - Translation/pronunciation tracks resolved via key-based metadata linking - Line timing hydration from token-level start/end values - 'kind' field added to Lyrics model and StructuredLyric API response (main/translation/pronunciation) - 'tokenLine' array in API response for word-level timing data - UTF-8 BOM and UTF-16 LE encoding support for TTML files - Fix for ambiguous time resolution in pronunciation spans (pre-1-minute) Frontend changes: - KaraokeLyricsOverlay rewritten with scrollable multi-line layout, word-level wipe highlighting with eased alpha transitions, rAF-driven playback clock with drift correction - Inline translation (above) and pronunciation (below) each main line, with smart filtering to hide redundant lines (same normalized text) - TR/PR toggle buttons and layer selection via selectLyricLayers() - Click-to-seek: click any lyric line to jump to that position - Customization popover with font-size sliders and color presets for each line type (TR/Default/PR), persisted to localStorage - Smooth font-size transition between active and inactive lines - Resizable overlay height via drag handle - lyrics.js: resolveKaraokeTokenWindow, buildSyntheticWordTokens, findLayerLineIndexForMain, token sorting, collapsed timing detection API extension (non-breaking, additive): - tokenLine[].token[] provides per-word start/end timing (ms) - tokenLine[].index maps back to the corresponding line[] entry - kind field: 'main', 'translation', 'pronunciation' - Clients ignoring tokenLine/kind continue to work unchanged