chore(tui): clean remaining Ink perf scaffolding

Trim narration comments and collapse small one-off helpers in the remaining ui-tui perf support files while preserving behaviour.

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

@@ -205,11 +205,6 @@ export default class App extends PureComponent<Props, State> {
       </TerminalSizeContext.Provider>
     )
   }
-  override componentDidMount() {
-    // Keep the native terminal cursor visible. Ink parks it at the declared
-    // input caret after each frame, so the terminal emulator provides the
-    // normal blinking block/bar without React-driven blink re-renders.
-  }
   override componentWillUnmount() {
     if (this.props.stdout.isTTY) {
       this.props.stdout.write(SHOW_CURSOR)
@@ -574,9 +569,7 @@ export function handleMouseEvent(app: App, m: ParsedMouse): void {
   const row = m.row - 1
   const baseButton = m.button & 0x03
 
-  // Allow disabling app click/selection handling while keeping wheel scroll
-  // and DOM mouse dispatch alive. Put this after coordinate/button decoding
-  // and exempt non-left buttons so scrollbar/right-click handlers still work.
+  // Disable app click handling without blocking wheel/right-click dispatch.
   if (isMouseClicksDisabled() && baseButton === 0) {
     return
   }

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

@@ -124,20 +124,6 @@ function ScrollBox({ children, ref, stickyScroll, ...style }: PropsWithChildren<
     })
   }
 
-  const scrollByNow = (dy: number) => {
-    const el = domRef.current
-
-    if (!el) {
-      return
-    }
-
-    el.stickyScroll = false
-    manualScrollAtRef.current = Date.now()
-    el.scrollAnchor = undefined
-    el.pendingScrollDelta = (el.pendingScrollDelta ?? 0) + Math.floor(dy)
-    scrollMutated(el)
-  }
-
   useImperativeHandle(
     ref,
     (): ScrollBoxHandle => ({
@@ -173,7 +159,19 @@ function ScrollBox({ children, ref, stickyScroll, ...style }: PropsWithChildren<
         }
         scrollMutated(box)
       },
-      scrollBy: scrollByNow,
+      scrollBy(dy: number) {
+        const el = domRef.current
+
+        if (!el) {
+          return
+        }
+
+        el.stickyScroll = false
+        manualScrollAtRef.current = Date.now()
+        el.scrollAnchor = undefined
+        el.pendingScrollDelta = (el.pendingScrollDelta ?? 0) + Math.floor(dy)
+        scrollMutated(el)
+      },
       scrollToBottom() {
         const el = domRef.current