PROMPT_SEARCH_PANEL_ROWS = 1 PROMPT_SEARCH_MAX_ROWS PROMPT_SEARCH_MAX_HINT_ROWSRows the panel reports at its tallest: query, results, and wrapped hint.
This is the ceiling on what show() can report, so it is what ChatInputBox
reserves when fitting a manual composer height and what the panel's own
max-height clamps to. _hint_rows() clamps the hint estimate to
PROMPT_SEARCH_MAX_HINT_ROWS so the two can never disagree -- the clamp lives
there, not in show(), because on_resize re-measures through the same helper
without going through show().