Mount el into a slot above the deck hotbar in #ui-bottom.
Creates the slot on demand; falls back to document.body if #ui-bottom is absent.
When requestId is supplied, el is shown only while that prompt is the
focused one (same focus-stack gating as mountTilePicker); without a
requestId the overlay is always visible, matching prior behavior.
Mount
elinto a slot above the deck hotbar in #ui-bottom. Creates the slot on demand; falls back to document.body if #ui-bottom is absent. WhenrequestIdis supplied,elis shown only while that prompt is the focused one (same focus-stack gating as mountTilePicker); without arequestIdthe overlay is always visible, matching prior behavior.