After the operator pressed `y` on the preflight modal (or
picked an agent in the picker), the modal's curses sub-window
stayed on screen until the dashboard's main loop ticked again
— which during a 5-10s launch made it look like the
confirmation never registered.
Add `_erase_modal` (touchwin + refresh on stdscr) and call it
at every exit from `_preflight_modal` and `_picker_modal`.
The pre-modal frame buffered on stdscr immediately overwrites
the sub-window's area; the launch proceeds with a clean
dashboard underneath.
didericis
e90d7dba76