BREAKING: Streamline PageLayout.Pane resizable API#7418

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Copilot wants to merge 5 commits intomake-primer-react-pagelayout-accept-persisterfrom

copilot/sub-pr-7348

Commits on Jan 3, 2026

Commits on Jan 5, 2026

Add discriminated unions and runtime warnings for PageLayout.Pane prop validation (#7419)

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mattcosta7
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Commits on Jan 6, 2026

Merge branch 'make-primer-react-pagelayout-accept-persister' into copilot/sub-pr-7348
mattcosta7
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