The fullscreen Plan Review overlay stayed mounted, focused, and fully
interactive after a choice was picked. showPlanReview's finish() resolves
the choice promise but deliberately defers the hide until #approvePlan
(guarded for #5688/#5319/#5689), so during slow async approval work — e.g.
context compaction — arrow keys still moved the cursor and repeat
Enter/Esc were silently swallowed by the settle guard, with the
fullscreen buffer masking all progress underneath. Users on Ghostty and
macOS Terminal read this as "/plan is frozen".
The overlay now flips to a committed state the moment a choice fires:
handleInput is a no-op, and the render shows a "<choice> — submitting…"
indicator plus an "applying your selection" footer. The deferred-hide
timing is untouched, so the existing stale-buffer and focus guards stay
intact.
Fixes#5926
roboomp
27b0d1722b