* 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>
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Co-authored-by: zuohl <zuohldev@gmail.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
