- PromptManagerConfig.INFINITE_SCROLL (web_ui.infinite_scroll) is reported
and saved through the settings API; only booleans are accepted
- Settings modal gains an "Infinite Scrolling" default; saving applies it
at once
- the results header gains an "Infinite scroll" checkbox that overrides the
default for the current session without saving
- when on, the next page is appended as the list nears its bottom (same
load-more rule as the gallery), page controls hide, a short page keeps
loading until the list fills, and a refresh after an edit restarts from
the top