Feature/apple music lyrics viewer

[HrishikeshBhandarkar]

Core: Smooth Lyrics Timeline Clock, Preferences, Romanizer API, and TTML Duet Parsing

What this PR does

Provides domain and service support for the Apple Music lyrics experience in SimpMusic:

1. Monotonic Clock Interpolation (domain):

   • Adds lastUpdateTimeMs to TimeLine in domain so the UI can compute sub-millisecond dead-reckoning elapsed time between player position updates.

2. Lyrics Display Preferences (domain):

   • Adds DataStore keys and accessors for lyrics presentation preferences (showLyricsTranslation, showLyricsRomanization, showLyricsOriginal) to DataStoreManager.

3. Romanizer Script Detection API (lyricsService):

   • Exposes LineScript enum and detectScript() as public APIs.
   • Adds scriptHint parameter support to LyricsRomanizer.romanize() to eliminate redundant script detection passes during per-syllable processing.

4. TTML Multi-Agent Duet & Background Vocal Parser (lyricsService):

   • Parses TTML timed text markup language from lyrics providers (BetterLyrics / Apple Music).
   • Detects Voice 2 agents (ttm:agent="v2", ttm:agent="v2000", voice2, etc.) and attaches [v2] tag for right-aligned duet rendering.
   • Extracts inline background vocals (ttm:role="x-bg") with balanced nesting scanners and attaches [bg] tag.
   • Formats syllable timing with <MM:SS.cc> timestamps and word-gap pauses.
   • Extracts songwriters metadata from TTML and maps it to domain models.

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Commits (4 commits)

1. b754f04 feat(domain): add lastUpdateTimeMs to TimeLine for smooth lyrics clock interpolation
2. 32307da feat(domain): add lyrics display preferences to DataStoreManager
3. 0a68503 feat(lyrics): expose LineScript and detectScript with scriptHint support in LyricsRomanizer
4. 826e560 feat(lyrics): support TTML multi-agent duet and background vocal parsing

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Targeted Branch

• Base: maxrave-dev/core:multiplatform
• Head: HrishikeshBhandarkar/core:feature/apple-music-lyrics-viewer

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Verification & Testing

• JVM Tests: :service:lyricsService:jvmTest passed (BUILD SUCCESSFUL), verifying gap timing, background vocal extraction, and multi-agent duet parsing.
• Cross-module Compilation: :common:compileKotlinJvm, :domain:compileKotlinJvm, and :data:compileKotlinJvm build cleanly with 0 errors.