fix(ui-tui): clear sticky prompt when follow snaps to bottom

Renderer-driven follow-to-bottom was restoring the viewport to the tail without notifying ScrollBox subscribers, so StickyPromptTracker could stay stale-visible. Notify on render-time scroll/sticky changes and treat near-bottom as bottom for prompt hiding.

ui-tui/packages/hermes-ink/src/ink/components/ScrollBox.tsx

@@ -257,6 +257,7 @@ function ScrollBox({ children, ref, stickyScroll, ...style }: PropsWithChildren<
 
         if (el) {
           el.scrollTop ??= 0
+          el.notifyScrollChange = notify
         }
       }}
       style={{