cli: share the stop-sessions confirmation prompt

Commit

Soph2mo ago

runStopAll and runStopMultiSelect repeated the confirm-form/cancel/ decline handling; extract confirmStopSessions. Covered by the existing session stop tests.

Co-Authored-By: Claude Fable 5 noreply@anthropic.com Entire-Checkpoint: 5c2527f62f77

Checkpoints

/goal simplify this repo, make sure to de-slop it continue until you are happy, make sure to backfill tests and validate any significant change. The output of this should be a PR with green CI, review

Claude CodeFable 5
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Checkpoint 1