Interactive install gets styled menus, confirms, multi-select and a
spinner around the system update when gum is available (dnf install
gum, installed optionally in the base section); every prompt falls
back to the classic numbered/yn prompts otherwise, and --yes runs
stay 100% non-interactive.
Call sites moved to ui_choose/ui_confirm/ui_choose_multi/ui_run:
DE + TWM menus (defaults preserved: none/none), SELinux + dotfiles
questions, advanced-menu category + multi-select app picker, reboot
prompt. Dead ask_choice/ask_yes_no removed.
Two bugs caught by pty-based harness testing before shipping:
- stdout is a pipe inside $(ui_...), so have_gum must test stdin +
/dev/tty, never -t 1 (gum would never have fired on a real term).
- fallback display output must go to >&2 — a stray newline on stdout
made choice='\nno' and broke every case match.
Pathfinder