fix(web): test friendliness

[eirikbacker]

• Several teams have experienced that their tests needs rework after launching @digdir/designsystemet-web
• This branch helps enhance backwards compatibility also for tests

Fixes:

• <Pagination.Button> again extends <Button> as it used to in @digdir/designsystemet-react
• invokers-polyfill/fn is inlined as the module resolvement is not Jest compatible
• ToggleGroup now uses pure aria-label instead og data-toggle-group
• All rendering runs instantly if possible (no more requestAnimationFrame+debounce in mutations)
• ReadOnly does not stop native actions like CMD+D for bookmarking etc
• Field has more surgical control of re-rendering to boost performance
• Field code is re-tested in screen readers and now includes documentation on why aria-labelledby is needed for fieldsets

[changeset-bot]

🦋 Changeset detected

Latest commit: 991f2dd

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@digdir/designsystemet-web	Patch
@digdir/designsystemet-react	Patch
@digdir/designsystemet	Patch
@digdir/designsystemet-css	Patch
@digdir/designsystemet-types	Patch

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[github-actions]

Preview deployments for this pull request:

storybook - 28. Mar 2026 - 14:24

themebuilder - 28. Mar 2026 - 14:24

www - 28. Mar 2026 - 14:30