chore: drop React 17 from supported peer dependency range

[unrevised6419]

What

Removes all traces of React 17 from the repo, mirroring strapi/strapi#26194.

• Tighten react / react-dom peerDependencies to ^18.0.0 (was ^17.0.0 || ^18.0.0) in:
  • @strapi/design-system
  • @strapi/icons
  • @strapi/ui-primitives
• Remove the React 17 client-only fallback (|| (() => undefined)) and its stale comment from the useId hook. Behavior under React 18 is identical — React.useId is always defined.
• Add changeset (patch bump for all three packages).

Why

The packages already build and test exclusively against react@18.3.1 (devDependencies) and rely on React 18-only APIs. The ^17 peer range was stale metadata. This is a peer-range correction, not a new behavioral break.

In practice React 17 was already impossible to use: the Strapi Admin entry point itself mounts via the React 18-only createRoot API (render.ts):

import { createRoot } from 'react-dom/client';
// ...
createRoot(mountNode).render(app.render());

So any consumer of this design system is already on React 18. The ^17 peer range only advertised support that could never be exercised.

Notes

devDependencies were already pinned to 18.3.1 — unchanged. No ReactDOM.render / version-check code paths exist in this repo (design-system, not the admin app), so the upstream PR's createRoot/batching notes don't apply to this repo's source.

🤖 Generated with Claude Code

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[changeset-bot]

🦋 Changeset detected

Latest commit: 02c2ede

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

This PR includes changesets to release 3 packages

Name	Type
@strapi/design-system	Patch
@strapi/icons	Patch
@strapi/ui-primitives	Patch

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

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud