fix(g-lite): createVec3 use nullish coalescing operator

[kindabit]

🤔 This is a ...

• New feature
• Bug fix
• Site / Document optimization
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• Refactoring
• Performance improvement
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• Other (about what?)

🔗 Related issue link

#2243

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• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
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[gemini-code-assist]

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[changeset-bot]

🦋 Changeset detected

Latest commit: d7104b2

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

This PR includes changesets to release 29 packages

Name	Type
@antv/g-lite	Patch
@antv/g-canvas	Patch
@antv/g-canvaskit	Patch
@antv/g-lottie-player	Patch
@antv/g-mobile-canvas	Patch
@antv/g-mobile-svg	Patch
@antv/g-mobile-webgl	Patch
@antv/g-plugin-3d	Patch
@antv/g-plugin-a11y	Patch
@antv/g-plugin-annotation	Patch
@antv/g-plugin-box2d	Patch
@antv/g-plugin-control	Patch
@antv/g-plugin-css-select	Patch
@antv/g-plugin-device-renderer	Patch
@antv/g-plugin-dragndrop	Patch
@antv/g-plugin-gesture	Patch
@antv/g-plugin-matterjs	Patch
@antv/g-plugin-physx	Patch
@antv/g-plugin-rough-canvas-renderer	Patch
@antv/g-plugin-rough-svg-renderer	Patch
@antv/g-plugin-yoga	Patch
@antv/g-plugin-zdog-canvas-renderer	Patch
@antv/g-plugin-zdog-svg-renderer	Patch
@antv/g-svg	Patch
@antv/g-web-components	Patch
@antv/g-webgl	Patch
@antv/g-webgpu	Patch
@antv/g	Patch
@antv/react-g	Patch

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[Copilot]

🟡 Changes recommended

The fixed typed-vector zero-coordinate behavior lacks targeted regression coverage.

1 open finding

• Add regression test for zero-valued typed-vector inputs · New

What changed in this PR

Fixes zero-valued vector coordinates being incorrectly replaced by fallback values in createVec3.

Changes:

• Uses nullish coalescing for vector coordinates.
• Removes unnecessary Euler conversion casts.
• Adds a patch changeset.

File	Description
packages/​g-lite/​src/​utils/​math.ts	Corrects vector fallback behavior and simplifies narrowing.
.changeset/​heavy-berries-greet.md	Records the patch release.

🧠 Review effort: Balanced

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[hustcc]

@kindabit What cases would trigger this difference?

[kindabit]

@hustcc when I try to move the center of the graph to the center of viewport, y is never changed. There is a reproduce in linked issue