Improvements and fixes
- Fixed numbers being read in Chinese within English sentences, and the article "a" being read as a letter.
- Fixed backup restoration failures and voices that could not play after restoring a backup from another app edition.
- Fixed the reading service showing as enabled when unavailable, and improved service recovery.
- Fixed narrator voice selection not taking effect. Voice assignments for the narrator and male and female leads can now be cleared.
- Improved reading speed and volume controls so displayed values match the saved settings.
- Improved handling of extra blank lines while preserving paragraph and chapter breaks.