Merge branch 'master' into charlesdedreuille/act-355-header-improvements

.changeset/brave-groups-learn.md

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+---
+'@backstage/ui': patch
+---
+
+Added `isPending` prop to Alert, Button, ButtonIcon, Table, and TableRoot as a replacement for the `loading` prop, aligning with React Aria naming conventions. The `loading` prop is now deprecated but still supported as an alias. CSS selectors now use `data-ispending` instead of `data-loading` for styling pending states; `data-loading` is still emitted for backward compatibility but will be removed alongside the `loading` prop.
+
+**Affected components:** Alert, Button, ButtonIcon, Table, TableRoot

.changeset/fix-scheduler-sleep-overflow.md

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+---
+'@backstage/backend-defaults': patch
+---
+
+Fixed scheduler `sleep` firing immediately for durations longer than ~24.8 days, caused by Node.js `setTimeout` overflowing its 32-bit millisecond limit.

.changeset/funny-areas-rescue.md

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+---
+'@backstage/ui': minor
+---
+
+Add support for flex item props (`grow`, `shrink`, and `basis`) to `Box`, `Card`, `Grid`, and `Flex` itself.
+
+**Affected components:** Box, Card, Grid, Flex

.changeset/owner-column-cleanup.md

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+---
+'@backstage/plugin-scaffolder': patch
+---
+
+Simplified the `OwnerEntityColumn` in the task list to rely on `EntityRefLink` and the entity presentation API instead of manually fetching entities from the catalog.