The keep-both merge nested main's plan-surface migration test inside a branch popover test and dropped the threadPanelVisibilityByThreadKey key from the migration results. Restore main's test body and include the branch's (empty) visibility map in the expected persisted shape. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Julius Marminge committed on 9/1/2026, 4:32:33 AMparent404a72a
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