Issue 3714: live collaborative preview reproduction, 2026-10-22 UTC
Environment: T3 Code Codex thread, Linux host, server-owned browser, 1280 x 800 viewport.
Running host build SHA unavailable; current-main regression covered separately.

07:09:38 preview_open(url="https://example.com") -> available true, Example Domain
preview_evaluate(document.querySelectorAll(".definitely-no-such-t3-target").length) -> 0
preview_click({selector:".definitely-no-such-t3-target",timeoutMs:15000})
-> isError true: Preview automation click timed out after 15000ms.

07:10:37 preview_evaluate added button #t3-working with window.clicks=0 and onclick increment.
preview_click({selector:"#t3-working",timeoutMs:15000}) -> success
preview_click({selector:".definitely-no-such-t3-target",timeoutMs:15000})
-> isError true: Preview automation click timed out after 15000ms.
preview_evaluate(window.clicks) -> 1

Snapshot action timeline retained internal detail:
locator.scrollIntoViewIfNeeded: Timeout 15000ms exceeded.
Agent-visible click error omitted selector and target state on both failures.
