Opt-in localStorage persistence for column widths. Call useColumnSizingPersistence(storageKey) and wire the returned columnSizing + onColumnSizingChange into <DataTableRoot> so resized widths survive reloads. Writes immediately, SSR-safe, and sanitizes corrupt storage.
pnpm dlx shadcn@latest add "https://niko-table.com/r/data-table-column-sizing-persistence.json"