Hi there! Welcome to Guileless Bopomofo 4.0.0 -- a major update!

* New User Phrase Manager: add, browse, and delete user phrases with bopomofo analysis, plus backup and restore support.
* Redesigned settings with bottom tab navigation for easier access.
* Fixed user phrases not persisting after force close.
* Comprehensive security and code quality audit with fixes applied.
* Added unit tests for events, ChewingUtil actions, and physical key handlers.

Thanks for using Guileless Bopomofo!
