Frustum: Honor sprite offset in intersectsSprite().

[Mugen87]

Fixed #24822.

Description

I've run into #24822 when changing the center properties of sprites.

The PR fixes the issue by implementing the approach suggested by @WestLangley in #24828. So the idea is to increase the bounding sphere's radius by an offset derived from the sprite's center.

The implementation does not affect the intersection test for sprites with a default center value.

Below is a live example with the code from the original issue for reproducing the issue. The white quad prematurely disappears when moving it to the left.

https://jsfiddle.net/831pgxnv/

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	337.65 78.76	337.65 78.76	+0 B +0 B
WebGPU	556.95 154.24	556.95 154.24	+0 B +0 B
WebGPU Nodes	556.3 154.01	556.3 154.01	+0 B +0 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	468.84 113.43	468.89 113.45	+51 B +24 B
WebGPU	632.69 171.2	632.75 171.25	+51 B +47 B
WebGPU Nodes	587.75 160.55	587.8 160.56	+51 B +9 B