fix(tui): tighten /resume render, follow-up to 42721dbe

- useVirtualHistory: track last-seen ScrollBox metrics in a ref inside
  the post-layout effect and bump ver when sticky/top/vp change — the
  subscribe-based rearm was sufficient for fresh clicks but not for the
  "hydrated mid-commit, measured empty, then metrics settle" path where
  nothing re-triggered the hook until the next unrelated keystroke
- useSessionLifecycle: resume scrollToBottom from queueMicrotask to
  setTimeout(..., 0) so the fresh transcript has a full task turn to
  commit + measure before we try to land at the newest content

ui-tui/src/app/useSessionLifecycle.ts

@@ -186,7 +186,7 @@ export function useSessionLifecycle(opts: UseSessionLifecycleOptions) {
                 status: 'ready',
                 usage: usageFrom(r.info ?? null)
               })
-              queueMicrotask(() => scrollRef.current?.scrollToBottom())
+              setTimeout(() => scrollRef.current?.scrollToBottom(), 0)
             })
             .catch((e: Error) => {
               sys(`error: ${e.message}`)