fix(tui): stabilize live progress rendering

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

@@ -38,6 +38,7 @@ export type ScrollBoxHandle = {
    * padding). Used for drag-to-scroll edge detection.
    */
   getViewportTop: () => number
+  getLastManualScrollAt: () => number
   /**
    * True when scroll is pinned to the bottom. Set by scrollToBottom, the
    * initial stickyScroll attribute, and by the renderer when positional
@@ -94,6 +95,7 @@ function ScrollBox({ children, ref, stickyScroll, ...style }: PropsWithChildren<
   // forces a React render: sticky is attribute-observed, no DOM-only path.
   const [, forceRender] = useState(0)
   const listenersRef = useRef(new Set<() => void>())
+  const manualScrollAtRef = useRef(0)
   const renderQueuedRef = useRef(false)
 
   const notify = () => {
@@ -130,6 +132,7 @@ function ScrollBox({ children, ref, stickyScroll, ...style }: PropsWithChildren<
     }
 
     el.stickyScroll = false
+    manualScrollAtRef.current = Date.now()
     el.scrollAnchor = undefined
     el.pendingScrollDelta = (el.pendingScrollDelta ?? 0) + Math.floor(dy)
     scrollMutated(el)
@@ -148,6 +151,7 @@ function ScrollBox({ children, ref, stickyScroll, ...style }: PropsWithChildren<
         // Explicit false overrides the DOM attribute so manual scroll
         // breaks stickiness. Render code checks ?? precedence.
         el.stickyScroll = false
+        manualScrollAtRef.current = Date.now()
         el.pendingScrollDelta = undefined
         el.scrollAnchor = undefined
         el.scrollTop = Math.max(0, Math.floor(y))
@@ -161,6 +165,7 @@ function ScrollBox({ children, ref, stickyScroll, ...style }: PropsWithChildren<
         }
 
         box.stickyScroll = false
+        manualScrollAtRef.current = Date.now()
         box.pendingScrollDelta = undefined
         box.scrollAnchor = {
           el,
@@ -205,6 +210,9 @@ function ScrollBox({ children, ref, stickyScroll, ...style }: PropsWithChildren<
       getViewportTop() {
         return domRef.current?.scrollViewportTop ?? 0
       },
+      getLastManualScrollAt() {
+        return manualScrollAtRef.current
+      },
       isSticky() {
         const el = domRef.current