chore(deps): update react monorepo to v19

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@types/react (source)	18.3.31 → 19.2.17
@types/react-dom (source)	18.3.7 → 19.2.3

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[doistbot]

This PR updates the React monorepo dependencies and widens the peer dependency ranges to introduce support for React 19. Expanding compatibility to the latest React release is a great step forward for the library's longevity. However, there are a few configuration and testing misalignments to address, including regenerating the out-of-sync lockfile, updating the @doist/reactist development dependency to resolve version conflicts, and ensuring the CI test suite covers all versions advertised in the widened peer dependency range.

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[doistbot]

[P1] package-lock.json still pins the root react, react-dom, @types/react, @types/react-dom, and peer ranges to the old 18.x values. Leaving this file out of sync with package.json will make npm ci fail; please regenerate and commit the lockfile with this version bump.

[doistbot]

[P1] This advertises React 19 support, but the repo still depends on @doist/reactist@30.1.4 for Storybook, and that package currently declares react/react-dom ^17 || ^18 in the lockfile. Please upgrade or remove that dependency before widening the published peer range, otherwise the React 19 setup remains unsupported in development.

[doistbot]

[P2] This widens the supported peer range to React 19, but npm test in CI still runs only against the single React version from devDependencies—which this PR also bumps to 19. That means the suite no longer exercises React 18 at all while we still advertise ^17 || ^18 || ^19 support here. Add a React-version test matrix/smoke test (at least 18 and 19), or narrow the peer range to the versions we actually verify.