Await published browser tab state in TUI smoke test

[lawrencecchen]

Summary

• replace fixed prefix-B and close delays with one final-deadline readiness probe
• observe the active workspace, active screen, and requested browser-tab count
• report the final workspace tree if publication never completes

Evidence

• red: PR9952 hosted run 31551446482 sampled list-workspaces before an active screen was published
• static: diff check passed
• local xhigh review: clean, 0.96
• local compile/tests: not run by instruction

Ledger effect: 0

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Summary by cubic

Make the TUI smoke test wait for the published active screen and browser tab state, removing flakiness when opening and closing the browser tab.

• Bug Fixes
  • Added wait_for_active_screen(predicate, description, seconds) to poll the workspace tree until the active screen matches the expected tab count/kind.
  • Replaced fixed delays in the browser open/close paths with the readiness probe, and switched to the CloseTab owner action (prefix-x) to avoid closing the pane.
  • On timeout, fail with the last workspace tree to aid debugging.

^{Written for commit c144d29. Summary will update on new commits.}

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