Hi there! Guileless Bopomofo 4.0.5 is here with UX polish.

* Re-added the single-character filter in the User Phrase Manager, so the list only shows phrases you intentionally created.
* Hid the app header in landscape to give settings more vertical room.
* Fixed the bottom navigation bar in dark theme: the selected icon and its backdrop now look right.
* Fixed the backup / restore / reset buttons so their labels stay readable in dark theme.

Thanks for using Guileless Bopomofo!
