fix(react): ignore stale token responses

[fatihcvs]

Changing useToken's endpoint, room or user starts a new request, but a slower response from the previous request can overwrite the newer token. The same race happens when the old response's JSON body finishes late.

Ignore state updates from an effect after its cleanup has run. This preserves the existing request and return API while ensuring obsolete requests cannot replace the current request's result. Includes a React patch changeset.

Validation:

• Four regression cases fail before the fix with old-token instead of new-token: endpoint, room and user changes, plus delayed JSON parsing.
• The tests use the real hook and Response objects in JSDOM, with controlled fetch/body promises. No network request or live token service is involved.
• 122 React/core/styles tests pass. React build (three package tasks), React lint (existing warnings, no errors), repository format and React API checks pass.

Developed and verified with OpenAI Codex assistance.

[changeset-bot]

🦋 Changeset detected

Latest commit: 7704ef5

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

This PR includes changesets to release 6 packages

Name	Type
@livekit/components-react	Patch
@livekit/agents-ui	Patch
@livekit/component-example-next	Patch
@livekit/components-js-docs	Patch
@livekit/component-docs-storybook	Patch
@livekit/components-docs-gen	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

[vercel]

@fatihcvs is attempting to deploy a commit to the LiveKit Team on Vercel.

A member of the Team first needs to authorize it.