The three curses menus (curses_checklist / curses_radiolist /
curses_single_select) each hand-rolled an identical event loop: cursor
hide + color-pair init, the per-frame clear/getmaxyx/refresh cycle,
scroll-offset math, row iteration, the read_menu_key dispatch with
NAV_UP/NAV_DOWN cursor wrap, flush_stdin, and the
KeyboardInterrupt/curses-unavailable fallback. Terminal-behavior changes
(e.g. Ghostty raw-escape handling, scroll tweaks, a new key) had to be
made in three places.
Extract that boilerplate into one _run_curses_menu driver. Each public
menu now supplies small callbacks for the parts that genuinely differ:
draw_header (returns the item-list start row), draw_row (checkbox vs
radio vs bare prefix), an on_action reducer (toggle-set vs return-cursor
vs return-None + the single_select cancel-row guard), an optional
draw_footer (the checklist status bar), reserve_bottom, and the numbered
fallback. Behavior is passed as functions; the loop is the only stateful
piece — so future terminal/Ghostty work is a one-place edit.
Duplicated event-loop primitives drop 3 -> 1 (stdscr.clear, read_menu_key
dispatch, scroll math). Verified byte-identical: a render harness records
every addnstr(y, x, clamped-text, attr) call across frames plus the
return value for 6 cases (checklist, checklist+status, radiolist,
radiolist+description, single_select, single_select ESC-cancel); output
diffs clean against origin/main. Non-TTY returns the cancel value
directly (not the input()-based numbered fallback), matching the old
per-menu guard. 150 menu/setup/browse/plugins tests pass.
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