fix(react): recognize swipes at coordinate zero

[fatihcvs]

useSwipe treats a clientX coordinate of 0 as if no touch was recorded. A swipe from 0 to 100 (or 100 to 0) never calls its direction callback, affecting grid pagination at the viewport edge.

Check for the null sentinel explicitly so zero remains a valid coordinate. The distance threshold and callback direction are unchanged. Includes a React patch changeset.

Validation:

• Five DOM-event tests exercise the real hook in JSDOM: both zero-coordinate cases failed before the fix; all five pass after it. Non-zero swipes, taps, short movements and the exact custom threshold are covered.
• React/core/styles: 123 tests pass. React build (three package tasks), React lint, repository format and React API checks pass.
• This verifies dispatched touch events in JSDOM, not physical-device touch behavior.

Developed and verified with OpenAI Codex assistance.

[changeset-bot]

🦋 Changeset detected

Latest commit: da98ffd

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

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