chore: upgrade to React 19

[mimarz]

Test just upgrade without making use of new features yet, so we can get new types and other improvements.

Test downstream what still works or don't.

Published under the test tag for @digdir/designsystemet-react

@digdir/designsystemet-react@test

[changeset-bot]

🦋 Changeset detected

Latest commit: 0c07942

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

This PR includes changesets to release 4 packages

Name	Type
@digdir/designsystemet-react	Minor
@digdir/designsystemet	Minor
@digdir/designsystemet-css	Minor
@digdir/designsystemet-theme	Minor

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

Preview deployments for this pull request:

Storybook - 10. Dec 2024 - 15:21

Storefront - 10. Dec 2024 - 15:22

Theme - 10. Dec 2024 - 15:22

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	54.76%	3146 / 5745
🔵	Statements	54.76%	3146 / 5745
🔵	Functions	86.95%	180 / 207
🔵	Branches	76.88%	509 / 662

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
packages/react/src/components/Modal/ModalTriggerContext.tsx	100%	100%	100%	100%
packages/react/src/components/form/Combobox/Combobox.tsx	88.46%	65.95%	71.42%	88.46%	163-164, 213-216, 258-259, 267, 276-277, 324-325, 433-457, 461-464
packages/react/src/components/form/Combobox/ComboboxContext.tsx	100%	100%	100%	100%
packages/react/src/components/form/Combobox/Option/useComboboxOption.tsx	93.1%	75%	100%	93.1%	37-38, 60-61
packages/react/src/utilities/RovingFocus/RovingFocusRoot.tsx	93.1%	68.18%	42.85%	93.1%	52, 55, 112-113, 132, 134
packages/react/src/utilities/hooks/useCheckboxGroup/useCheckboxGroup.ts	100%	90.69%	100%	100%
packages/react/src/utilities/hooks/useRadioGroup/useRadioGroup.ts	100%	90.47%	100%	100%

Generated in workflow #1222 for commit 0c07942 by the Vitest Coverage Report Action

[mimarz]

Seems to work fine on demo app in https://github.com/mimarz/designsystemet-demo but its pretty basic