Preview 10 (225bc25)

feat: update from previews, load Home honestly, and use the full keyboard

Release builds find newer previews on GitHub. A dot on the settings
button and a row at the top of Settings offer the update, which
downloads into an install session and hands it to Android.

Home lists a host's sessions only while it is online, and shows
placeholder rows while it connects, so it no longer shows a list from
before a drop.

The terminal is a plain text field without suggestions for the input
method, so keyboards offer voice input and gesture typing and show no
number row, while characters still arrive one at a time.

Acknowledgements and the README credit RexPocket for the idea.