data-size='xs' doesn't type-check on re-exported Ds* components

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### Description

We ran into this in altinn-access-management-frontend: `` doesn't type-check, even though it renders exactly the way we want it to.

As far as I can tell, this package adds `xs` to the size scale in its own generated theme — `--ds-size--xs` is in `dist/tokens/design-tokens-build/theme.css` and isn't in `@digdir/designsystemet-theme` 1.11.0 — and since `dist/global.css` imports that after the upstream theme, `xs` wins and works fine at runtime. But the re-exported `Ds*` components still carry Designsystemet's `data-size?: Size`, which is only `'sm' | 'md' | 'lg'`, so TypeScript rejects a size the package itself styles.

Your own `Button` already handles this, with `ButtonSize = 'xs' | 'mini' | DsButtonProps['data-size']`. The ones we've hit are `DsAlert`, `DsPopover.Trigger`, `DsPagination` and `DsDialog.Trigger`.

Could the re-exported components' `data-size` be widened to match the scale the theme actually ships?

### Additional Information

Seen on 0.72.5, with `@digdir/designsystemet-{css,react,types}` 1.15.0 and `-theme` 1.11.0.

### Tasks

_No response_

### Acceptance Criterias

_No response_

Start by comparing the existing ButtonSize typing with the re-exported DsAlert, DsPopover.Trigger, DsPagination, and DsDialog.Trigger props. Reproduce the type-check failure and inspect the generated theme files to confirm the shipped size scale. Done means the named re-exports accept the supported xs size while their existing sizes remain valid.

Written by the indexing model from the issue text.