#31644 base red: queued steer footer at 360px, wrapping

HOLD: work in progress, diagnosing the red first.

webviews/test/queued-user-footer.test.ts "queued and sent bubble and footer keep their position at 360px, wrapping" fails in dark and light on feat-cmux-next. Body updated with the cause and fix.

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Summary by cubic

Diagnoses the failing queued-user-footer test at the tip of feat-cmux-next: "queued and sent bubble and footer keep their position at 360px, wrapping" fails in dark and light mode on the base branch. This PR bisects the cause by reverting three candidate footer changes and re-running the 360px wrapping cases.

• The probe reverts each candidate on the base: the reply time in a hover tooltip, the buttons leading the footer row, and the final footer's Copy showing without hover.
• .probe/run.sh runs the failing test on base and with each candidate reverted, reporting pass/fail counts per variant.