v0.1.47 · More reliable alarms and files

Summary: we reinforced the Android alarm foundation and clearly separated opening a folder from changing its path.

Improvements

New native foundation for alarms with a safe internal sound.
Better Android exact-alarm permission diagnostics.
Alarms created in the same minute are no longer discarded because of seconds.
The alarms panel distinguishes active alarms from alarms without a valid next execution.
Open folder now tries to open the saved path; change path is separate.