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* Update MediaSession metadata for car Bluetooth display * Implement `upMediaMetadata` in `BaseReadAloudService` to sync book details and cover art to `MediaSessionCompat`. * Map book name to title, chapter name to artist, and author to album metadata keys. * Support displaying current reading content as a subtitle/lyric string. * Trigger metadata updates across `HttpReadAloudService` and `TTSReadAloudService` during playback and navigation. * Apply suggestions from code review Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com> --------- Co-authored-by: zuohl <zuohldev@gmail.com> Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>