Match the row-budget naming introduced in PR #11260 for the approval and
clarify panels: rename chrome_reserve=14 into reserved_below=6 (input
chrome below the panel) + panel_chrome=6 (this panel's borders, blanks,
and hint row) + min_visible=3 (floor on visible items). Same arithmetic
as before, but a reviewer reading both files now sees the same handle.
Compact-chrome mode is intentionally not adopted — that pattern fits the
"fixed mandatory content might overflow" shape of approval/clarify
(solved by truncating with a marker), whereas the picker's overflow is
already handled by the scrolling viewport.
86f02d8d71